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SAT Chemistry

Category - Multiple Choice

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Which of the following species is isoelectronic with krypton?

K⁺
Se^-
Br^-
Ar
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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