Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number Sm - 62 ; Eu = 63; Tb = 65; Gd = 64, Pm = 61) A. Sm B. Eu C. Tb D. Gd E. Pm Choose the correc

Question

Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number Sm - 62 ; Eu = 63; Tb = 65; Gd = 64, Pm = 61) A. Sm B. Eu C. Tb D. Gd E. Pm Choose the correct answer from the options given below :

(A) A and B only
(B) C and D only
(C) B and D only
(D) A and E only

Prashant Kotian · Accepted Answer

Correct answer: C. Sm(Z = 62)= 4f6s2 Eu(Z = 63) = 4f76S2 Tb (Z = 65) = 4f96s2 Gd (Z = 64) = 4f75d16s2 Pm (Z = 61) = 4f56s2 Here Eu & Gd have half-filled configuration

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