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 dot structure of H2S, how many lone pairs are present on the central sulfur atom?
A
3
B
2
C
1
D
0
Verified step by step guidance1
Identify the central atom in the molecule H2S, which is sulfur (S), because it is less electronegative than hydrogen and can form multiple bonds.
Determine the total number of valence electrons for sulfur. Sulfur is in group 16, so it has 6 valence electrons.
Recognize that each hydrogen atom contributes 1 valence electron, and there are 2 hydrogens, so total electrons from hydrogen are 2.
Draw single bonds between sulfur and each hydrogen atom, using 2 electrons per bond, which accounts for 4 electrons total.
Subtract the bonding electrons from sulfur's valence electrons to find the remaining electrons, which will be placed as lone pairs on sulfur. Each lone pair consists of 2 electrons, so divide the remaining electrons by 2 to find the number of lone pairs on sulfur.
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