To describe how a covalent link forms. To use the octet preeminence to covalent compounds

You have already seen instances of substances that contain covalent bonds. One substance mentioned previously was water (\(\ceH2O\)). You deserve to tell indigenous its formula that it is no an ionic compound; it is not created of a metal and a nonmetal. Consequently, its nature are different from those that ionic compounds.

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Electron Sharing

Previously, we debated ionic bonding wherein electrons have the right to be transferred from one atom to an additional so the both atoms have actually an energy-stable external electron shell. Since most fill electron shells have eight electron in them, lifwynnfoundation.orgists referred to as this propensity the octet rule. However, over there is another way an atom can attain a complete valence shell: atoms deserve to share electrons.

This concept can be illustrated by using 2 hydrogen atoms, every of which has actually a solitary electron in its valence shell. (For little atoms such together hydrogen atoms, the valence covering will it is in the first shell, i beg your pardon holds just two electrons.) We have the right to represent the two individual hydrogen atoms together follows:


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The Lewis chart of two hydrogen atom sharing electron looks like this:

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This relenten of molecule is simplified additional by utilizing a dash to stand for a covalent bond. The hydrogen molecule is then represented as follows:

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Each fluorine atom contributes one valence electron, make a solitary bond and giving each atom a complete valence shell, i m sorry fulfills the octet rule:


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The circles present that each fluorine atom has eight electrons roughly it. As with hydrogen, we deserve to represent the fluorine molecule with a dash in ar of the bonding electrons:


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In this molecule, the hydrogen atom go not have actually nonbonding electrons, when the fluorine atom has actually six nonbonding electrons (three lone electron pairs). The circles show how the valence electron shells are filled because that both atoms.


Example \(\PageIndex1\)

Use Lewis diagrams to indicate the formation of the following:

Cl2 HBr

Solution

a. When two chlorine atoms type a chlorine molecule, lock share one pair the electrons. In Cl2 molecule, every chlorine atom is surrounded by an octet number of electrons.

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The Lewis diagram because that a Cl2 molecule is comparable to the one for F2 (shown above).


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