Question

The number of d-electrons in $F{e}^{2+}$ (Z = 26) is not equal to the number of electrons in which one of the following?

• A. p-electrons in Cl (Z = 17)
• B. d-electrons in Fe (Z= 26)
• C. p-electrons in Ne (Z = 10)
• D. s-electrons in Mg (Z = 12)

Answer 1

Answer: (A)

$F{e}^{2+}=3d^6$ (number of 'd' electrons = 6)

In Cl $=1s^{2}2s^{2}2p^{6}2s^{2}3p^5$ (number of 'p' electrons = 12)

In Fe (number of 'd' electrons = 6) and in Mg ((number of 's' electrons = 6)