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  3. Chemistry
  4. 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 :

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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 :

JEE MainJEE Main 2023The d-and f-Block Elements

Solution:

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. ${ }_1 Pm : 4 \,f ^5 \,6 s ^2$