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Which of the following are isoelectronic species, i.e., those having the same number of electrons?

Na+, K+, Mg2+, Ca2+, S2-, Ar.

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Species Atomic number No. of electrons on the species
Na+ 11 10
K+ 19 18
Mg2+ 12 10
Ca2+ 20 18
S2- 16 18
Ar 18 18

Thus, Na+ and Mg2+ are isoelectronic and K+, Ca2+, S2- and Ar are also isoelectronic.

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