The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following ?

Question

The number of d-electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following ?

d-electrons in Fe (Z = 26)

p-electrons in Ne (Z = 10)

s-electrons in Mg (Z = 12)

p-electrons in Cl(Z = 17)

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