SAT Chemistry

Category - Multiple Choice

Which of the following species is isoelectronic with krypton?
  1. K+
  2. Se-
  3. Br-
  4. Ar
  5. I-
Explanation
Answer: Br-

When two species are isoelectronic, they have the same number of electrons. In this case, Br- is isoelectronic with krypton because both species possess 36 electrons.
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