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Unshared, or lone, electron pairs play an important role in determining the chemical and physical properties of organic compour Thus, it is important to know which atoms carry unshared pairs.
Use the structural formulas below to determine the number of unshared pairs at each designated atom.
Be sure your answers are consistent with the formal charges on the formulas.
The number of unshared pairs at atom $\mathbf{a}$ is $\square$ The number of unshared pairs at atom $\mathbf{b}$ is $\square$ The number of unshared pairs at atom $\mathbf{c}$ is $\square$ The number of unshared pairs at atom $\mathbf{a}$ is $\square$ The number of unshared pairs at atom $\mathbf{b}$ is $\square$
The number of unshared pairs at atom $\mathbf{c}$ is $\square$
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Answer from Sia

Posted 6 months ago

Solution

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1 Answer

The number of unshared pairs at atom $\mathbf{a}$ is 0

The number of unshared pairs at atom $\mathbf{b}$ is 0

The number of unshared pairs at atom $\mathbf{c}$ is 1

2 Answer

The number of unshared pairs at atom $\mathbf{a}$ is 3

The number of unshared pairs at atom $\mathbf{b}$ is 0

The number of unshared pairs at atom $\mathbf{c}$ is 0

Key Concept

Unshared pairs of electrons are determined by the octet rule and the bonding preferences of atoms in molecules.

Explanation

Nitrogen with a positive charge has no unshared pairs, carbon with four bonds has no unshared pairs, and oxygen with a negative charge has one unshared pair in the first molecule. In the second molecule, oxygen with a single bond has three unshared pairs, while both carbons with four bonds have no unshared pairs.

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