Covalent Bonding WebQuest
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Covalent Bonding WebQuest - why do atoms form chemical bonds
Covalent Bonding WebQuest – why do atoms form chemical bonds | why do atoms form chemical bonds

Chemical bonds are about disconnected into two fundamentally altered types: ionic and covalent. In reality, however, the bonds in best substances are neither absolutely ionic nor absolutely covalent, but lie on a spectrum amid these extremes. Although absolutely ionic and absolutely covalent bonds represent acute cases that are hardly encountered in any but actual simple substances, a abrupt altercation of these two extremes helps explain why substances with altered kinds of actinic bonds acquire actual altered properties. Ionic compounds abide of absolutely and abnormally answerable ions captivated calm by able electrostatic forces, admitting covalent compounds about abide of molecules, which are groups of atoms in which one or added pairs of electrons are aggregate amid affirmed atoms. In a covalent bond, atoms are captivated calm by the electrostatic allure amid the absolutely answerable nuclei of the affirmed atoms and the abnormally answerable electrons they share. This affiliate will focus on the backdrop of covalent compounds.

Just as an atom is the simplest assemblage that has the axiological actinic backdrop of an element, a atom is the simplest assemblage that has the axiological actinic backdrop of a covalent compound. Thus, the appellation diminutive admixture is acclimated to call elements that are covalently affirmed and to analyze the compounds from ionic compounds. Some authentic elements abide as covalent molecules. Hydrogen, nitrogen, oxygen, and the halogens action artlessly as the diatomic (“two atoms”) molecules H2, N2, O2, F2, Cl2, Br2, and I2 (part (a) in Figure 4.1). Similarly, a few authentic elements abide as polyatomic (“many atoms”) molecules, such as basal phosphorus and sulfur, which action as P4 and S8 (part (b) in Figure 4.1).

Figure 4.1 Elements That Abide as Covalent Molecules. (a) Several elements artlessly abide as diatomic molecules, in which two atoms (E) are aing by one or added covalent bonds to anatomy a atom with the accepted blueprint E2. (b) A few elements artlessly abide as polyatomic molecules, which accommodate added than two atoms. For example, phosphorus exists as P4 tetrahedra—regular polyhedra with four triangular sides—with a phosphorus atom at anniversary vertex. Basal sulfur consists of a channelled arena of eight sulfur atoms affiliated by distinct bonds. Selenium is not apparent due to the complication of its structure.

Each covalent admixture is represented by a diminutive formula, which gives the diminutive attribute for anniversary basic element, in a assigned order, accompanied by a subscript advertence the cardinal of atoms of that aspect in the molecule. The subscript is accounting alone if the cardinal of atoms is greater than 1. For example, water, with two hydrogen atoms and one oxygen atom per molecule, is accounting as H2O. Similarly, carbon dioxide, which contains one carbon atom and two oxygen atoms in anniversary molecule, is accounting as CO2.

Covalent compounds that predominantly contain carbon and hydrogen are alleged amoebic compounds. The assemblage for apery the formulas of amoebic compounds is to address carbon first, followed by hydrogen and again any added elements in alphabetical adjustment (e.g., CH4O is methyl alcohol, a fuel). Compounds that abide primarily of elements added than carbon and hydrogen are alleged asleep compounds; they accommodate both covalent and ionic compounds. The assemblage for autograph asleep compounds, involves advertisement the basic elements alpha with the one extreme to the larboard in the alternate table, as in CO2 or SF6. Those in the aforementioned accumulation are listed alpha with the lower aspect and alive up, as in ClF. By convention, however, back an asleep admixture contains both hydrogen and an aspect from groups 13–15, hydrogen is usually listed aftermost in the formula. Examples are ammonia (NH3) and silane (SiH4). Compounds such as water, whose compositions were accustomed continued afore this assemblage was adopted, are consistently accounting with hydrogen first: Baptize is consistently accounting as H2O, not OH2. About this distinguishes back hydrogen is accommodating in a covalent band rather than an ionic interaction, as apparent in abounding of the asleep acids, such as hydrochloric acerbic (HCl) and sulfuric acerbic (H2SO4), as declared in affiliate 3.

In Affiliate 3, we saw that ionic compounds are composed predominantly of a metal a nonmetal.  Covalent molecules, on the otherhand, are about composed of two nonmetals or a nonmetal and a metalloid.  This is an antecedent screening adjustment that you can use to assort compounds into the ionic or the covalent cagetogy.

Figure 4.2 Recognizing Ionic vs Covalent Compounds. About compounds that are formed from a aggregate of a metal with a nonmetal acquire added ionic band appearance admitting compounds formed from two nonmetals or a metalloid and a nonmetal appearance added covalent character. Although compounds usually lie on a spectrum about amid absolutely ionic and absolutely covalent character, for allotment purposes, this guideline works well.

Chapter 3 declared how electrons can be transferred from one atom to accession so that both atoms acquire an energy-stable alien electron carapace afterward the octet rule. However, there is accession way an atom can accomplish a abounding valence shell: atoms can allotment electrons to ability the octet accompaniment (or the affiliation accompaniment in the case of hydrogen).

This abstraction can be illustrated by application two hydrogen atoms, anniversary of which has a distinct electron in its valence shell. (For baby atoms such as hydrogen atoms, the valence carapace will be the aboriginal shell, which holds alone two electrons.) We can represent the two alone hydrogen atoms as follows:

In this bearings neither hydrogen can ability the adopted affiliation state.  In contrast, back two hydrogen atoms get aing abundant calm to allotment their electrons, they can be represented as follows:

By administration their valence electrons, both hydrogen atoms now acquire two electrons in their corresponding valence shells. Because anniversary valence carapace is now filled, this adjustment is added abiding than back the two atoms are separate. In this configuration, anniversary hydrogen has an electron agreement agnate to that of the blue-blooded gas, helium. The administration of electrons amid atoms is alleged a covalent bond, and the two electrons that accompany atoms in a covalent band are alleged a bonding brace of electrons. A detached accumulation of atoms affiliated by covalent bonds is alleged a molecule—the aboriginal allotment of a admixture that retains the actinic appearance of that compound. For example, one atom of baptize would accommodate two hydrogen atoms and one oxygen atom (H2O).

Chemists frequently use Lewis electron dot diagrams to represent covalent bonding in diminutive substances. For example, the Lewis diagrams of two abstracted hydrogen atoms are as follows:

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The Lewis diagram of two hydrogen atoms administration electrons looks like this:

This delineation of molecules is simplified added by application a birr to represent a covalent bond. The hydrogen atom is again represented as follows:

Remember that the dash, additionally referred to as a distinct bond, represents a brace of bonding electrons.

The band in a hydrogen molecule, abstinent as the ambit amid the two nuclei, is about 7.4 × 10−11 m, or 74 picometers (pm; 1 pm = 1 × 10−12 m). This accurate band breadth represents a antithesis amid several forces:  (1) the attractions amid abnormally answerable electrons and nuclei, (2) the abhorrence amid two abnormally answerable electrons, and (3) the abhorrence amid two absolutely answerable nuclei. If the nuclei were afterpiece together, they would repel anniversary added added strongly; if the nuclei were added apart, there would be beneath allure amid the absolute and abrogating particles.

Fluorine is accession aspect whose atoms band calm in pairs to anatomy diatomic (two-atom) molecules. Two abstracted fluorine atoms acquire the afterward electron dot diagrams:

Each fluorine atom contributes one valence electron, authoritative a distinct band and giving anniversary atom a complete valence shell, which fulfills the octet rule:

The circles appearance that anniversary fluorine atom has eight electrons about it. As with hydrogen, we can represent the fluorine atom with a birr in abode of the bonding electrons:

Each fluorine atom has six electrons, or three pairs of electrons, that are not accommodating in the covalent bond. Rather than actuality shared, they are advised to accord to a distinct atom. These are alleged nonbonding pairs (or abandoned pairs) of electrons.

Now that we acquire looked at electron administration amid atoms of the aforementioned element, let us attending at covalent band accumulation amid atoms of altered elements. Consider a atom composed of one hydrogen atom and one fluorine atom:

Each atom needs one added electron to complete its valence shell. By anniversary accidental one electron, they accomplish the afterward molecule:

In this molecule, the hydrogen atom does not acquire nonbonding electrons, while the fluorine atom has six nonbonding electrons (three abandoned electron pairs). The circles appearance how the valence electron shells are abounding for both atoms (recall that hydrogen is abounding with two electrons).

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Larger molecules are complete in a agnate fashion, with some atoms accommodating in added than one covalent bond. For example, water, with two hydrogen atoms and one oxygen atom, and methane (CH4), with one carbon atom and four hydrogen atoms, can be represented as follows:

Atoms about anatomy a acclimatized cardinal of covalent bonds in compounds. Figure 4.3 shows valence electron configurations of anniversary aspect ancestors (or column).

Fig 4.3 Alternate Table with Lewis Structures.  Anniversary ancestors shows a adumbrative lewis anatomy for that accumulation of elements.  For the nonmetals (Families 4A, 5A, 6A, and 7A) they can acquire a commutual cardinal of aggregate bonds to ability the octet state. Ancestors 4A can allotment 4 covalent bonds (4 4 = 8), admitting Families 5A, 6A, and 7A can allotment 3, 2, and 1 covalent bond(s), respectively, to accomplish the octet state. Exceptions to the octet aphorism do exist. For example, hydrogen can be advised to be in Accumulation 1 or Accumulation 7A because it has backdrop agnate to both groups. Hydrogen can participate in either ionic or covalent bonding. Back accommodating in covalent bonding, hydrogen alone needs two electrons to acquire a abounding valence shell. As it has one electron to alpha with, it can alone accomplish one covalent bond. Similarly, boron has 3 electrons in its alien shell.  This nonmetal about forms 3 covalent bonds, accepting a best of 6 electrons in its alien shell.  Thus, boron can never ability the octet state. Added atoms can acquire broadcast orbitals and acquire added covalent bonds. Two of these that are important for active systems are sulfur and phosphorus. By the octet rule, sulfur can accomplish 2 covalent bonds and phosphorus 3 covalent bonds. Sulfur can additionally acquire broadcast orbitals to acquire 4 or 6 covalent bonds, and phosphorus can aggrandize to 5 covalent bonds.

In abounding molecules, the octet aphorism would not be annoyed if anniversary brace of affirmed atoms shares alone two electrons. Consider carbon dioxide (CO2). If anniversary oxygen atom shares one electron with the carbon atom, we get the following:

This does not accord either the carbon or oxygen atoms a complete octet; The carbon atom alone has six electrons in its valence carapace and anniversary oxygen atom alone has seven electrons in its valence shell. Thus, none of the atoms can ability the octet accompaniment in the accepted configuration. As written, this would be an ambiguous diminutive conformation.

Sometimes added than one brace of electrons allegation be aggregate amid two atoms for both atoms to acquire an octet. In carbon dioxide, a additional electron from anniversary oxygen atom is additionally aggregate with the axial carbon atom, and the carbon atom shares one added electron with anniversary oxygen atom:

In this arrangement, the carbon atom shares four electrons (two pairs) with the oxygen atom on the larboard and four electrons with the oxygen atom on the right. There are now eight electrons about anniversary atom. Two pairs of electrons aggregate amid two atoms accomplish a bifold band amid the atoms, which is represented by a bifold dash:

Some molecules accommodate amateur bonds, covalent bonds in which three pairs of electrons are aggregate by two atoms. A simple admixture that has a amateur band is acetylene (C2H2), whose Lewis diagram is as follows:

A alike band (also alleged a dative covalent bond) is a covalent band (a aggregate brace of electrons) in which both electrons appear from the aforementioned atom. A covalent band is formed by two atoms administration a brace of electrons. The atoms are captivated calm because the electron brace is admiring by both of the nuclei. In the accumulation of a simple or accustomed covalent bond, anniversary atom food one electron to the band – but that does not acquire to be the case. In the case of a alike covalent bond, one atom food both of the electrons and the added atom does not accumulation any of the electrons. The afterward acknowledgment amid ammonia and hydrochloric acerbic demonstrates the accumulation of a alike covalent band amid ammonia and a hydrogren ion (proton).

If these achromatic gases are accustomed to mix, a blubbery white smoke of solid ammonium chloride is formed.

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The all-embracing acknowledgment is

NH3(g) HCl(g) → NH4Cl(s)

Ammonium ions, NH4 , are formed by the alteration of a hydrogen ion (a proton) from the hydrochloric acerbic atom to the abandoned brace of electrons on the ammonia molecule. To anticipate this reaction, we can use electron dot configurations to beam the electron movement during the reaction.  Aboriginal anamnesis the valence electron states for all of the atoms complex in the reaction:

On the larboard ancillary of the blueprint (to the larboard of the arrow) are the reactants of the acknowledgment (ammonia and hydrochloric acid).  On the acclimatized ancillary of the acknowledgment (to the acclimatized of the arrow) is the artefact of the reaction, the ionic admixture – ammonium chloride.  The diagram beneath shows the electron and proton movement during the reaction.

Figure 4.4 Accumulation of Ammonium Chloride. Back the ammonium ion, NH4 , is formed, the fourth hydrogen (shown in red) is absorbed by a alike covalent bond, because alone the hydrogen’s basis is transferred from the chlorine to the nitrogen. The hydrogen’s electron is larboard abaft on the chlorine to anatomy a abrogating chloride ion. Once the ammonium ion has been formed it is absurd to acquaint any aberration amid the alike covalent and the accustomed covalent bonds, all of the hydrogens are agnate in the atom and the added absolute allegation is broadcast throughout the molecule. Although the electrons are apparent abnormally in the diagram, there is no aberration amid them in reality. In simple diagrams, a alike band is apparent by a arced arrow. The arrow credibility from the atom altruistic the abandoned brace to the atom accepting it.

Although we authentic covalent bonding as electron sharing, the electrons in a covalent band are not consistently aggregate appropriately by the two affirmed atoms. Unless the band connects two atoms of the aforementioned element, there will consistently be one atom that attracts the electrons in the band added acerb than the added atom does, as apparent in Figure 4.5. Back such an alterity occurs, there is a consistent accretion of some abrogating allegation (called a fractional abrogating allegation and appointed δ−) on one ancillary of the band and some absolute allegation (designated δ ) on the added ancillary of the bond. A covalent band that has an diff administration of electrons, as in allotment (b) of Figure 4.5, is alleged a arctic covalent bond. A covalent band that has an according administration of electrons (part (a) of Figure 4.5) is alleged a nonpolar covalent bond.

Figure 4.5 Arctic against Nonpolar Covalent Bonds. (a) The electrons in the covalent band are appropriately aggregate by both hydrogen atoms. This is a nonpolar covalent bond. (b) The fluorine atom attracts the electrons in the band added than the hydrogen atom does, arch to an alterity in the electron distribution. This is a arctic covalent bond.

Any covalent band amid atoms of altered elements is a arctic bond, but the amount of polarity varies widely. Some bonds amid altered elements are alone minimally polar, while others are acerb polar. Ionic bonds can be advised the ultimate in polarity, with electrons actuality transferred absolutely rather than shared. To adjudicator the about polarity of a covalent bond, chemists use electronegativity, which is a about admeasurement of how acerb an atom attracts electrons back it forms a covalent bond.

There are assorted afterwards scales for appraisement electronegativity. Figure 4.6 shows one of the best popular—the Pauling scale. The polarity of a covalent band can be advised by free the aberration in the electronegativities between the two atoms authoritative the bond. The greater the aberration in electronegativities, the greater the alterity of electron administration in the bond.

Figure 4.6 Electronegativities of Assorted Elements. The Pauling Calibration for electronegativities has the amount for fluorine atoms set at 4.0, the accomplished value.

Although there are no adamantine and fast rules, the accepted aphorism is that a aberration in electronegativity beneath than 0.4 indicates the band is nonpolar; when the aberration is greater than 0.4, the band is advised polar. When the aberration in electronegativities is ample abundant (generally greater than about 1.8), the consistent admixture is advised ionic rather than covalent. An electronegativity aberration of zero, of course, indicates a nonpolar covalent bond. Examples of electronegativity aberration are apparent in Figure  4.7.

Figure 4.7 Electronegativity Aberration Diagram. The diagram aloft is a adviser for acute what blazon of band forms amid two altered atoms. By demography the aberration amid the electronegativity ethics for anniversary of the atoms complex in the bond, the band blazon and polarity can be predicted. Note that abounding ionic appearance is rarely reached, about back metals and nonmetals anatomy bonds, they are alleged application the rules for ionic bonding.

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When a molecule’s bonds are polar, the atom as a accomplished can affectation an asperous administration of charge, depending on how the alone bonds are oriented. For example, the acclimatization of the two O–H bonds in a baptize atom (Figure 4.8) is bent: one end of the atom has a fractional absolute charge, and the added end has a fractional abrogating charge. In short, the atom itself is polar. The polarity of baptize has an astronomic appulse on its concrete and actinic properties. (For example, the baking point of baptize [100°C] is aerial for such a baby atom and is due to the actuality that arctic molecules allure anniversary added strongly.) In contrast, while the two C=O bonds in carbon dioxide are polar, they lie anon adverse anniversary added in the molecule and so aish anniversary other’s effects. Thus, carbon dioxide molecules are nonpolar overall. This abridgement of polarity influences some of carbon dioxide’s properties. (For example, carbon dioxide becomes a gas at −77°C, about 200° lower than the temperature at which baptize boils.)

Figure 4.8 Concrete Backdrop and Polarity. The concrete backdrop of baptize (a) and carbon dioxide (b) are afflicted by their diminutive polarities. Note that the arrows in the diagram consistently point in the administration area the electrons are added acerb attracted. In this diagram, the basin attribute (δ) is acclimated with a ( ) or (-) attribute to represent fractional absolute and fractional abrogating allegation administration in arctic covalent bonds. Note that the electrons aggregate in arctic covalent bonds will be admiring to and absorb added time about the atom with the college electronegativity value. Back the polarity is according and anon opposing, as in the case of carbon dioxide (b), the all-embracing atom will acquire no all-embracing charge.

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Molecular compounds acquire abounding backdrop that alter from ionic compounds.  Some of the generalizations for this accumulation accommodate abundant lower melting and baking credibility back compared with their ionic counterpoints.  For example, baptize (H2O) has a melting point of 4oC and a baking point of 100oC compared with NaCl that has a melting point of 801oC and a baking point of 1,413oC. This is because the abounding accuse created in ionic bonds acquire abundant stronger adorable force than the analogously anemic fractional accuse created in covalent molecules. thus, ionic compounds tend to anatomy actual able apparent filigree structures due to the repeating accuse of the cation and anion components. Covalent compounds, on the otherhand, do not about acquire such well-structured 3-dimensional shapes.  Appropriately they tend to be added breakable and breach added calmly back in solid form, and abounding are begin in aqueous and gas phases. In addition, due to their abridgement of charges, they tend to be poor electrical and thermal conductors. Abounding are additionally baffling in baptize due to their nonpolar attributes (ie oil and baptize don’t mix).

Table 4.1 shows accepted differences amid covalent and ionic compounds.

Table 4.1 Allegory of Ionic and Covalent Compounds

Recall that a diminutive blueprint shows the cardinal of atoms of anniversary aspect that a atom contains. A atom of baptize contains two hydrogen atoms and one oxygen atom, so its blueprint is H2O. A atom of octane, which is a basic of gasoline, contains 8 atoms of carbon and 18 atoms of hydrogen. The diminutive blueprint of octane is C8H18. Back autograph the actinic blueprint the aspect that is the atomic electronegative (the aspect that is added larboard or added bottomward aural the aforementioned ancestors group) is accounting aboriginal while the added electronegative aspect is accounting second. You will be acclimatized to apperceive how to name simple bifold covalent compounds (compounds composed of two altered elements)

.

Figure 4.9 Nitrogen dioxide (NO2) is a brownish baneful gas that is a arresting air pollutant produced by centralized agitation engines.

The elements that amalgamate to anatomy bifold diminutive compounds are both nonmetal atoms or they are a aggregate of a nonmetal and a metalloid. This contrasts with ionic compounds, which were formed from a metal ion and a nonmetal ion. Therefore, bifold diminutive compounds are altered because ionic accuse cannot be acclimated to name them or to address their formulas. Accession aberration is that two nonmetal atoms will frequently amalgamate with one accession in a array of ratios. Consider the elements nitrogen and oxygen. They amalgamate to accomplish several compounds including

They all can’t be alleged nitrogen oxide. How would addition apperceive which one you were talking about? Anniversary of the three compounds has actual altered backdrop and reactivity. A arrangement to analyze amid compounds such as these is necessary.

Prefixes are acclimated in the names of bifold diminutive compounds to analyze the cardinal of atoms of anniversary element. The table beneath shows the prefixes up to ten.

Table 4.2 Prefixes acclimated for Classification of Bifold Covalent Molecules

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Unit 10 Honors Review Key – why do atoms form chemical bonds | why do atoms form chemical bonds

The rules for application the prefix arrangement of classification of bifold compounds can be abbreviated as follows.

Note: the a or o at the end of a prefix is usually alone from the name back the name of the aspect begins with a vowel. As an example, four oxygen atoms, is tetroxide instead of tetraoxide. Some examples of diminutive compounds are listed in Table 4.3.

Table 4.3 Examples of Allotment Covalent Molecules

Notice that the mono- prefix is not acclimated with the nitrogen in the aboriginal compound, but is acclimated with the oxygen in both of the aboriginal two examples. The S2Cl2 emphasizes that the formulas for diminutive compounds are not bargain to their everyman ratios. The o of the mono- and the a of hepta- are alone from the name back commutual with oxide. For example:

Atoms can allotment pairs of valence electrons to access a valence carapace octet. This administration of electrons is a covalent bond. A breed formed from covalently affirmed atoms is a atom and is represented by a diminutive formula, which gives the cardinal of atoms of anniversary blazon in the molecule. The two electrons aggregate in a covalent band are alleged a bonding brace of electrons. The electrons that do not participate in covalent bonds are alleged nonbonding pairs (or abandoned pairs) of electrons. A covalent band consisting of one brace of aggregate electrons is alleged a distinct bond.

Covalent bonds action amid nonmetal atoms. Allotment simple covalent compounds follows simple rules agnate to those for ionic compounds. However, for covalent compounds, afterwards prefixes are acclimated as all-important to specify the cardinal of atoms of anniversary aspect in the compound.

In some cases, added than one brace of electrons is aggregate to amuse the octet rule. Two pairs of electrons are aggregate by two atoms to accomplish a bifold bond. Three pairs of atoms are aggregate to accomplish a amateur bond. Single, double, and amateur covalent bonds may be represented by one, two, or three dashes, respectively, amid the syms of the atoms. In the case of a alike covalent bond, one atom food both of the electrons and the added atom does not accumulation any of the electrons.

To adjudicator the about polarity of a covalent bond, chemists use electronegativity, which is a about admeasurement of how acerb an atom attracts electrons back it forms a covalent bond. The greater the electronegativity aberration amid the atoms complex in the covalent bond, the added polarity the band displays.

In allegory to ionic compounds, covalent molecules tend to acquire lower melting and baking points, are beneath acrid in water, and are poor conductors of electricity. These above differences are abundantly due to added polarity of ionic bonds back compared with covalent bonds.

Chapter 4 abstracts acquire been acclimatized from the afterward artistic aliment assets unless contrarily noted:

1. Amoebic Chemistry Portal. WikiUniversity. Available at:  https://en.wikiversity.org/wiki/Portal:Organic_chemistry

2. Anonymous. (2012) Introduction to Chemistry: General, Organic, and Biological (V1.0). Appear beneath Artistic Aliment by-nc-sa 3.0. Available at: http://2012books.lardbucket.org/books/introduction-to-chemistry-general-organic-and-biological/index.html

3. Poulsen, T. (2010) Introduction to Chemistry. Appear beneath Artistic Aliment by-nc-sa 3.0. Available at: http://openedgroup.org/books/Chemistry.pdf

4. Molecules and Diminutive Compounds. (2017) Libretexts. Available at: https://chem.libretexts.org/Textbook_Maps/General_Chemistry_Textbook_Maps/Map:_Chemistry:_The_Central_Science_(Brown_et_al.)/02._Atoms,_Molecules,_and_Ions/2.6:_Molecules_and_Molecular_Compounds

5. Clark, J. (2017) ‘General Principles of Actinic Bonding’ Appear by Libretexts. Available at: https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Chemical_Bonding/General_Principles_of_Chemical_Bonding/Coordinate_(Dative_Covalent)_Bonding

6. OpenStax (2015) Atoms, Isotopes, Ions, and Molecules: The Building Blocks. OpenStax CNX.Available at:  http://cnx.org/contents/[email protected]

What is a Chemical Bond? A chemical bond is a force holding two or ..
What is a Chemical Bond? A chemical bond is a force holding two or .. | why do atoms form chemical bonds

7.  Wikipedia, Ionic Compound. Available at: https://en.wikipedia.org/wiki/Ionic_compound

8. Concrete and Theoretical Chemistry (2017) Libretexts. Available at: https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Chemical_Bonding/General_Principles_of_Chemical_Bonding/Covalent_Bonds_vs_Ionic_Bonds.

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