Multiple Choice
Which of the following correctly represents the Lewis dot structure for the beryllium ion Be^{2+}?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Ions
Multiple Choice
Which of the following best describes the Lewis dot structure for the NH_2^+ ion?
A
Nitrogen is bonded to two hydrogens, has one lone pair, and carries a positive charge.
B
Nitrogen is bonded to two hydrogens, has no lone pairs, and carries a positive charge.
C
Nitrogen is bonded to two hydrogens, has two lone pairs, and carries a positive charge.
D
Nitrogen is bonded to three hydrogens, has one lone pair, and carries a positive charge.
Verified step by step guidance1
Step 1: Determine the total number of valence electrons for the NH_2^+ ion. Nitrogen has 5 valence electrons, each hydrogen has 1 valence electron, and since the ion has a positive charge, subtract one electron from the total count.
Step 2: Draw the skeletal structure with nitrogen as the central atom bonded to two hydrogen atoms.
Step 3: Distribute the remaining valence electrons around the atoms to satisfy the octet rule for nitrogen and the duet rule for hydrogen, keeping in mind the total number of electrons calculated.
Step 4: Check the number of lone pairs on nitrogen after bonding with two hydrogens and accounting for the positive charge, which reduces the number of electrons available for lone pairs.
Step 5: Conclude that nitrogen is bonded to two hydrogens, has no lone pairs, and carries a positive charge, which matches the correct Lewis structure for the NH_2^+ ion.
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