Multiple Choice
Which of the following statements correctly describes the Lewis dot structure for the ionic compound Ca3N2?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Ions
Multiple Choice
Which of the following statements correctly describes the Lewis dot structure for the ion formed from SnBr2?
A
The Sn atom forms two single bonds with Br atoms and has no lone pairs; the molecule is neutral.
B
The Sn atom forms two single bonds with Br atoms, has one lone pair, and the ion carries a 2- charge.
C
The Sn atom forms two single bonds with Br atoms and has one lone pair; the molecule is neutral.
D
The Sn atom forms two single bonds with Br atoms, has one lone pair, and the ion carries a 2+ charge.
Verified step by step guidance1
Identify the central atom and the atoms bonded to it: In SnBr2, tin (Sn) is the central atom bonded to two bromine (Br) atoms.
Determine the total number of valence electrons available: Tin (Sn) is in group 14, so it has 4 valence electrons, and each bromine (Br) atom is in group 17, so each has 7 valence electrons. For SnBr2, total valence electrons = 4 (Sn) + 2 × 7 (Br) = 18 electrons.
Consider the charge on the ion: Since the problem mentions an ion, adjust the total valence electrons by adding or subtracting electrons according to the charge. For example, if the ion has a 2+ charge, subtract 2 electrons from the total count.
Draw the Lewis structure by connecting Sn to each Br with single bonds, then distribute the remaining electrons to satisfy the octet rule for each atom. Remember to place lone pairs on atoms as needed, especially on Sn if it has extra electrons after bonding.
Analyze the resulting structure: Check the number of bonds and lone pairs on Sn, and confirm the overall charge of the ion matches the electron count used. This will help determine which statement correctly describes the Lewis structure.
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