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Chemistry-

General

Easy

Question

Which one of the following sets of ions represents the collection of isoelectronic species

(a) $K^{+}, C l^{-}, M g^{2 +}, S c^{3 +}$
$N a^{+}, C a^{2 +}, S c^{3 +}, F^{-}$
(c) $K^{+}, C a^{2 +}, S c^{3 +}, C l^{-}$
$N a^{+}, M g^{2 +}, A l^{3 +}, C l$

The correct answer is: (c) $K to the power of plus end exponent comma C a to the power of 2 plus end exponent comma S c to the power of 3 plus end exponent comma C l to the power of minus end exponent$

Isoelectronic species are those which have same no. of electrons.
$K to the power of plus end exponent equals 19 minus 1 equals 18$ ; $C a to the power of plus 2 end exponent equals 20 minus 2 equals 18$
$S c to the power of plus 3 end exponent equals 21 minus 3 equals 18$ ; $C l to the power of minus end exponent equals 17 plus 1 equals 18$

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