ChemistryWhich one of the following sets of ions represents the collection of isoelectronic species ?

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

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

Solution:

$K^{+}, C a^{+ 2}, S c^{+ 3}$ and $C l^{-}$ all have 18 electrons.

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