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Question

Calculate the Zeff on the electron present in 5d orbital of Gd (Atomic number =64).

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Solution

Electronic configuration of Gd is
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f7
5s2 5p6 5d1 6s2
For d electrons,
screening constant = 61 (ns, np and (n -1) electrons contribute 1 to the shielding effect)
Zeffective=6461=3

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