Multiple Choice
Which of the following statements correctly describes the Lewis dot structure of the neutral compound C2H2Cl2?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
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Which of the following best describes the Lewis dot structure of ammonia (NH_3)?
A
Nitrogen atom with three single bonds to hydrogen atoms and no lone pairs.
B
Nitrogen atom with one double bond to a hydrogen atom and two single bonds to hydrogen atoms.
C
Nitrogen atom with two single bonds to hydrogen atoms and two lone pairs.
D
Nitrogen atom with three single bonds to hydrogen atoms and one lone pair of electrons on nitrogen.
Verified step by step guidance1
Recall that the Lewis dot structure represents the valence electrons of atoms in a molecule, showing bonds and lone pairs explicitly.
Determine the total number of valence electrons: Nitrogen has 5 valence electrons, and each hydrogen has 1 valence electron, so for NH_3, total valence electrons = 5 + (3 × 1) = 8 electrons.
Place the nitrogen atom in the center because it is less electronegative than hydrogen and can form multiple bonds.
Form single bonds between nitrogen and each of the three hydrogen atoms, using 2 electrons per bond, which accounts for 6 electrons.
Assign the remaining 2 electrons as a lone pair on the nitrogen atom, completing its octet and resulting in a Lewis structure with three single N-H bonds and one lone pair on nitrogen.
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