Multiple Choice
Which of the following statements correctly describes the Lewis dot structure of the SF_6 molecule?
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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 of the bromate ion, BrO3^-?
A
BrO3^- has two Br–O single bonds, one Br–O triple bond, and two lone pairs on bromine.
B
BrO3^- has one Br=O double bond, two Br–O single bonds, and one lone pair on bromine.
C
BrO3^- has three Br=O double bonds and no lone pairs on bromine.
D
BrO3^- has three Br–O single bonds and no lone pairs on bromine.
Verified step by step guidance1
Step 1: Determine the total number of valence electrons for the bromate ion (BrO3^-). Bromine (Br) has 7 valence electrons, each oxygen (O) has 6 valence electrons, and the ion has an extra electron due to the negative charge. Calculate the sum: \(7 + 3 \times 6 + 1\).
Step 2: Draw a skeletal structure with bromine as the central atom bonded to three oxygen atoms. Connect each oxygen to bromine with a single bond initially.
Step 3: Distribute the remaining valence electrons to satisfy the octet rule for the oxygen atoms first, placing lone pairs around them to complete their octets.
Step 4: Check the octet of the central bromine atom. If bromine does not have a complete octet, form double bonds by converting lone pairs from oxygen atoms into bonding pairs with bromine. Consider resonance structures and formal charges to find the most stable arrangement.
Step 5: Identify the correct Lewis structure by verifying the number of bonds (single or double) between bromine and oxygen atoms, the number of lone pairs on bromine, and ensuring the overall charge of the ion is -1.
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