Multiple Choice
Which of the following best describes the correct Lewis dot structure for the neutral compound AsH3?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
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Which of the following statements correctly describes the Lewis dot structure of dimethylamine, (CH3)2NH?
A
The nitrogen atom forms a double bond with one carbon atom and two single bonds with hydrogen atoms.
B
The nitrogen atom has one lone pair and forms three single bonds: two to carbon atoms and one to a hydrogen atom.
C
The nitrogen atom has two lone pairs and forms two single bonds: one to a carbon atom and one to a hydrogen atom.
D
The nitrogen atom forms four single bonds: two to carbon atoms and two to hydrogen atoms, with no lone pairs.
Verified step by step guidance1
Recall that the Lewis dot structure represents valence electrons as dots and shows how atoms are bonded in a molecule, including lone pairs and bonding pairs of electrons.
Identify the central atom in dimethylamine, (CH3)2NH, which is nitrogen (N), and note that nitrogen typically forms three bonds and has one lone pair in amines.
Recognize that each methyl group (CH3) is bonded to nitrogen via a single bond, so nitrogen forms two single bonds to two carbon atoms from the methyl groups.
Since the molecule is dimethylamine, nitrogen also forms one single bond to a hydrogen atom, making a total of three single bonds around nitrogen.
Finally, remember that nitrogen in amines has one lone pair of electrons, so the correct Lewis structure shows nitrogen with three single bonds (two to carbons and one to hydrogen) and one lone pair.
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