Question on: JAMB Chemistry - 2019
The following are isoelectronic ions except
A
Na\(^+\)
B
Mg\(^{2+}\)
C
Si\(^{2+}\)
D
O\(^{2+}\)
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Correct Option: C
Isoelectronic refers to two atoms, ions, or molecules that have the same electronic structure and the same number of valence electrons. Atoms or ions with the same electronic configurations are said to be isoelectronic to each other or to have the same isoelectronicity
Na\(^+\) = 10 electrons = 2, 8
Mg\(^{2+}\) = 10 electrons = 2,8
O\(^{2-}\) = 10 electrons = 2,8
Si\(^{2+}\) = 12 electrons = 2,8,2
\(\implies\) Si\(^{2+}\) is not isoelectronic with the rest.
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