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 1s22s22p63s23p63d104s24p64d104f7 5s25p65d16s2
For d electrons,
screening constant = 61 (ns, np and (n -1) electrons contribute 1 to the shielding effect) Zeffective=64−61=3