Multiple Choice
Which of the following is the correct Lewis dot structure for formaldehyde (CH2O)?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
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In the Lewis structure of CH$_3$NH$_2$, what is the number of lone pairs present on the nitrogen atom?
A
3
B
2
C
0
D
1
Verified step by step guidance1
Identify the central atoms in the molecule CH$_3$NH$_2$. Here, nitrogen (N) is bonded to three hydrogen atoms and one carbon atom (from the CH$_3$ group).
Recall that nitrogen has 5 valence electrons. In bonding, nitrogen typically forms three bonds to complete its octet, using 3 of its valence electrons for bonding.
Determine how many electrons are left on nitrogen after forming bonds. Since nitrogen forms 3 bonds, it uses 3 electrons, leaving 2 electrons unshared.
Recognize that these 2 unshared electrons on nitrogen form one lone pair, as a lone pair consists of 2 electrons.
Conclude that the nitrogen atom in CH$_3$NH$_2$ has exactly one lone pair of electrons.
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