A) \[N{{a}^{+}}\]
B) \[Ar\]
C) \[M{{g}^{2+}}\]
D) \[Kr\]
Correct Answer: B
Solution :
\[C{{a}^{+}}(2,\text{ }8,\text{ }8)\]and\[Ar(2,\text{ }8,\text{ }8)\]contain equal number (18) of electrons, hence they are iso-electronic.
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