Discussion
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
Answer: D
The odd one out is the p-electrons in Cl (Z = 17).
\(\mathrm{Fe^{2+}}\) is \([\mathrm{Ar}]3d^6\), so it has six d-electrons. Neon \((1s^2 2s^2 2p^6)\) has six p-electrons and magnesium \((1s^2 2s^2 2p^6 3s^2)\) six s-electrons, while neutral Fe is \([\mathrm{Ar}]3d^6 4s^2\) and also has six d-electrons. Chlorine is \(1s^2 2s^2 2p^6 3s^2 3p^5\), giving \(6+5=11\) p-electrons.
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