Select the ion set where all ions are isoelectronic with argon.

Select the ion set where all ions are isoelectronic with argon.

Select the ion set where all ions are isoelectronic with argon.



(a) Sc3+, N3-
(b) N3-, Se2-
(c) K+, Ca2+, Sc3+.
(d) Ca2+, Se2-, Sc3+.
(e) Se2-, Sc3+.


Answer: (c) K+, Ca2+, Sc3+.


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