To describe how a covalent shortcut forms. To use the octet rule to covalent compounds

You have already seen examples of substances that contain covalent bonds. One substance stated previously was water (\(\ceH2O\)). You deserve to tell from its formula the it is not an ionic compound; the is not created of a metal and also a nonmetal. Consequently, its nature are various from those the ionic compounds.

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Electron Sharing

Previously, we debated ionic bonding where electrons deserve to be transferred from one atom to another so that both atoms have an energy-stable external electron shell. Because most to fill electron shells have actually eight electrons in them, moment-g.comists referred to as this propensity the octet rule. However, over there is another method an atom can attain a full valence shell: atoms have the right to share electrons.

This ide can be portrayed by using two hydrogen atoms, each of which has a single electron in its valence shell. (For little atoms such as hydrogen atoms, the valence shell will it is in the an initial shell, i m sorry holds just two electrons.) We can represent the two individual hydrogen atoms together follows:


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The Lewis diagram of 2 hydrogen atom sharing electrons looks prefer this:

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This explicate of molecule is simplified further 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, do a solitary bond and giving every atom a finish valence shell, i beg your pardon fulfills the octet rule:


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The circles display that every 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 does not have actually nonbonding electrons, if the fluorine atom has actually six nonbonding electron (three lone electron pairs). The circles display how the valence electron shells space filled for both atoms.


Example \(\PageIndex1\)

Use Lewis diagrams to suggest the formation of the following:

Cl2 HBr

Solution

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

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


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