1.

\[N{{a}^{+}},\ M{{g}^{2+}},A{{l}^{3+}}\] and \[S{{i}^{4+}}\] are isoelectronic. The order of their ionic size is

A. \[N{{a}^{+}}>\ M{{g}^{2+}}<A{{l}^{3+}}<S{{i}^{4+}}\]
B. \[N{{a}^{+}}<\ M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]
C. \[N{{a}^{+}}>\ M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]
D. \[N{{a}^{+}}<\ M{{g}^{2+}}>A{{l}^{3+}}<S{{i}^{4+}}\]
Answer» D. \[N{{a}^{+}}<\ M{{g}^{2+}}>A{{l}^{3+}}<S{{i}^{4+}}\]


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