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 :

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

Tardigrade Admin · Accepted Answer

1. 62 Sm: 4 f 6 6 s 2 2. 64 Gd: 4 f 7 5 d 1 6 s 2 3. 63 Eu: 4 f 7 6 s 2 4. 65 Tb: 4 f 9 6 s 2 5. 1 Pm: 4 f 5 6 s 2

Q. Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic number $S m = 62; E u = 63; T b = 65; G d = 64, P m = 61$ )
A. $S m$
B. $E u$
C. $T b$
D. Gd
E. $P m$
Choose the correct answer from the options given below :

A and B only

C and D only

B and D only

A and E only

1. $_{62} S m : 4 f^{6} 6 s^{2}$
2. $_{64} G d : 4 f^{7} 5 d^{1} 6 s^{2}$
3. $_{63} E u : 4 f^{7} 6 s^{2}$
4. $_{65} T b : 4 f^{9} 6 s^{2}$
5. $_{1} P m : 4 f^{5} 6 s^{2}$

Q. 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 :