MCAT General Chemistry Question 186: Answer and Explanation

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Question: 186

6. Denver is at a higher altitude than Los Angeles and therefore the atmospheric pressure is lower in Denver than in Los Angeles. Compared to Los Angeles, the melting point of water in Denver will be:

A. Cl^-
B. Ca²⁺
C. Cr⁺
D. As

Correct Answer: D

Explanation:

D Electron energy level is determined by the first two quantum numbers. Given Cl^- = [Kr], Ca²⁺ = [Ar], Cr⁺ = [Ar] 3d ⁵, and As = [Ar] 4s²3d¹⁰4p³, arsenic contains electrons in the highest energy subshell, 4p.

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