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Chemistry Question on Molecular Orbital Theory

The isoelectronic set of ions is :

A

\ceN3−,Li+,Mg2+\ce{N^{3-}, Li^{+}, Mg^{2+}} and \ceO2−\ce{O^{2-}}

B

\ceLi+,Na+,O2−\ce{Li^{+}, Na^{+}, O^{2-} } and \ceF−\ce{F^{-}}

C

\ceF−,Li+,Na+\ce{F^{-}, Li^{+}, Na^{+} } and \ceMg2+\ce{Mg^{2+}}

D

\ceN3−,O2−,F−\ce{N^{3-}, O^{2-} , F^{-}} and \ceNa+\ce{Na^{+}}

Answer

\ceN3−,O2−,F−\ce{N^{3-}, O^{2-} , F^{-}} and \ceNa+\ce{Na^{+}}

Explanation

Solution

N−3−>1s2  2s2  2p6 {N^{-3} -> 1s^2 \; 2s^2 \; 2p^6} Li+−>1s2 {Li^{+} -> 1s^2} Mg+2→1s2  2s2  2p6 {Mg^{+2} \to 1s^2 \; 2s^2 \; 2p^6} O−2→1s2  2s2  2p6 {O^{-2} \to 1s^2 \; 2s^2 \; 2p^6} F−→1s2  2s2  2p6 {F^{-} \to 1s^2 \; 2s^2 \; 2p^6} Na+→1s2  2s2  2p6 {Na^{+} \to 1s^2 \; 2s^2 \; 2p^6} N−3,O−2,F− {N^{-3} , O^{-2} , F^{- }} and Na+ {Na^{+}} are isoelectronic