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

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

NTA AbhyasNTA Abhyas 2020Classification of Elements and Periodicity in Properties

Solution:

$Fe^{2 +}=3d^{6}$ (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)