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Which of These Species Make an Isoelectronic Pair: Cl^-, O^2-

Question 41

Multiple Choice

Which of these species make an isoelectronic pair: Cl^-, O^2-, F, Ca²⁺, Fe³⁺?

A) Ca²⁺ and Fe³⁺
B) O^2-and F
C) F and Cl^-
D) Cl^-and Ca²⁺
E) None of the species are part of an isoelectronic series.

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