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  4. The electronic configurations of Eu(Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are

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Q. The electronic configurations of Eu(Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are

JIPMERJIPMER 2019The d-and f-Block Elements

Solution:

Eu $(63)=[X e] 4 f^{7} 6 s^{2}$
Gd $(64)=[X e] 4 f^{7} 5 d^{1} 6 s^{2}$
Tb $(65)=[X e] 4 f^{9} 6 s^{2}$