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

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

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Electron Sharing

Previously, we disputed ionic bonding wherein electrons deserve to be transferred from one atom to one more so that both atoms have actually an energy-stable external electron shell. Because most fill electron shells have eight electrons in them, jajalger2018.orgists referred to as this tendency the octet rule. However, there is another way an atom can accomplish a full valence shell: atoms deserve to share electrons.

This ide can be illustrated by using two hydrogen atoms, every of which has a solitary electron in that is valence shell. (For little atoms such together hydrogen atoms, the valence covering will be the an initial shell, i m sorry holds only two electrons.) We deserve to represent the 2 individual hydrogen atoms together follows:


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

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This explicate of molecule is simplified further by making use of a dash to represent a covalent bond. The hydrogen molecule is then stood for as follows:

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Each fluorine atom contributes one valence electron, making a solitary bond and giving each atom a complete valence shell, i beg your pardon fulfills the octet rule:


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The circles show that every fluorine atom has actually eight electrons around it. Similar to hydrogen, we can represent the fluorine molecule v a dash in place of the bonding electrons:


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


Example \(\PageIndex1\)

Use Lewis diagrams to suggest the development of the following:

Cl2 HBr

Solution

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

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


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