Multiple Choice
Which of the following statements correctly describes the Lewis dot structure for the SO_3^{2-} ion?
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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 ion CBr3−?
A
Carbon is surrounded by three bromine atoms and one lone pair, with a negative charge on carbon.
B
Carbon is surrounded by three bromine atoms and two lone pairs, with a negative charge on one of the bromine atoms.
C
Carbon is surrounded by three bromine atoms and one hydrogen atom, with a negative charge on bromine.
D
Carbon is surrounded by three bromine atoms and no lone pairs, with a negative charge on one of the bromine atoms.
Verified step by step guidance1
Identify the central atom and the surrounding atoms in the ion CBr3⁻. Carbon (C) is typically the central atom because it can form four bonds, and bromine (Br) atoms are the surrounding atoms.
Determine the total number of valence electrons available. Carbon has 4 valence electrons, each bromine has 7 valence electrons, and there is an extra electron due to the negative charge. Calculate the total as: \(4 + 3 \times 7 + 1\).
Distribute the electrons to form bonds between carbon and each bromine atom. Each bond consists of 2 electrons, so place 2 electrons between carbon and each bromine to represent single bonds.
Assign the remaining electrons as lone pairs to satisfy the octet rule for each atom. Bromine atoms typically have three lone pairs to complete their octet. Check if carbon has a complete octet; if not, assign lone pairs or charges accordingly.
Analyze the resulting structure to determine where the negative charge resides. Since carbon can have a lone pair and the negative charge, verify if carbon has three bonds to bromine and one lone pair, which would place the negative charge on carbon.
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