Which of the following are isoelectronic species? Na^+, K^+, Mg^(2+),

1.	Which of the following are isoelectronic species? Na^+, K^+, Mg^(2+), S^(2-), Ar.
Answer» Solution :Isoelectronic - species having some NUMBER of electrons `._(11)Na^(+) = 11 - 1 = 10 e^(-) , ._(19)K^(+) = 19-1 = 18e^(-)` `._(12)Mg^(2+) = 12 - 2 = 10 e^(-) , ._(20)Ca^(2+) = 20 - 2 = 18e^(-)` `._(16)S^(2-) = 16 + 2 = 18 e^(-) , ._(18)Ar = 18 e^(-)` HENCE the isoelectronic species are (i) `Na^(+) and Mg^(2+) ""(ii) K^(+) , Ca^(2+), S^(2-) and Ar`.

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