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Chemistry Question on Structure of atom

In the following sets of ions, which one is not isoelectronic with the rest of the species? O2−,F−,Na,Mg2+,Al3+,Ne{ O^{2-}, F^- , Na, Mg^{2+}, Al^{3+}, Ne}

A

\ceMg2+\ce{Mg^{2+} }

B

\ceAl3+\ce{Al^{3+}}

C

\ceO2−\ce{O^{2-} }

D

\ceNa\ce{Na }

Answer

\ceNa\ce{Na }

Explanation

Solution

O2−(10e−),F−(10e−),Na(11e−),Mg2+(10e−),Al3+(10e−){ O^{2-} (10e^-), F^-(10 e^-), Na(11 e^-), Mg^{2+}(10 e^-), Al^{3+}(10 e^-) } and Ne(10e−){Ne(10 e^-)} .
Thus, Na is not isoelectronic with the rest of the species.