Discussion
The total number of electrons in d orbital in Fe2+ ion (atomic number of Fe is 26) is not equal to that of the total number of :
Answer: C
The number that differs is the number of p electrons in the Cl− ion.
Fe is [Ar] 3d6 4s2; Fe2+ loses the two 4s electrons and keeps 3d6, so it has 6 d electrons.
- Ne, 1s2 2s2 2p6: 6 p electrons.
- Fe atom, 3d6: 6 d electrons.
- Mg, 1s2 2s2 2p6 3s2: 6 s electrons.
- Cl−, 18 electrons, 1s2 2s2 2p6 3s2 3p6: 12 p electrons.
Only Cl− does not match the 6 of Fe2+.
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