A. Na+
B. Mg²+
C. Si²+
D. O²+
Correct Answer:
Option C – Si²+
Explanation
Two or more ions are said to be isoelectronic if they have the same electronic structure and the same number of valence electrons.
Na+ = 10 electrons = 2, 8
Mg²+ = 10 electrons = 2,8
O²− = 10 electrons = 2,8
Si²+ = 12 electrons = 2,8,2
⟹ Si²+ is not isoelectronic with the rest.
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