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+.