MCAT General Chemistry Question 259: Answer and Explanation

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Question: 259

1. Which of the following species is isoelectronic with the silver ion in AgCl?

  • A. Rh+
  • B. Pd
  • C. Cd2+
  • D. In-

Correct Answer: C

Explanation:

C Isoelectronic species have the same electron configurations, and hence the same number of electrons. Ag+ has 46 electrons, eliminating choices A and D because they have 44 and 50 electrons, respectively. The electron configuration of Ag+ is [Kr] 4d10. The electron configuration of Pd is [Kr] 5s23d 7 (eliminate choice B). The electron configuration of Cd2+ is [Kr] 4d10, which is isoelectronic with Ag+.

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