Which of the following are isoelectronic species, i.e., those having t – InterviewSolution

1.

Which of the following are isoelectronic species, i.e., those having the same number of electrons?Na+, K+, Mg2+, Ca2+, S2-, Ar.

Answer»

Species	Atomic number	No. of electrons on the species
Na⁺	11	10
K⁺	19	18
Mg²⁺	12	10
Ca²⁺	20	18
S^2-	16	18
Ar	18	18

Thus, Na⁺ and Mg²⁺ are isoelectronic and K⁺, Ca²⁺, S^2- and Ar are also isoelectronic.

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