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Periodic Table and Periodicity question

2023 · 31 Jan · Shift 2 · Q5
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  5. /2023 · 31 Jan · Shift 2 · Q5

Periodic Table and Periodicity question

2023 · 31 Jan · Shift 2 · Q5

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
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\mathrm{Sm}=62 ; \mathrm{Eu}=63 ; \mathrm{Tb}=65 ; \mathrm{Gd}=64, \mathrm{Pm}=61Sm=62;Eu=63;Tb=65;Gd=64,Pm=61) A. Sm\mathrm{Sm}Sm B. Eu C. Tb\mathrm{Tb}Tb D. Gd E. Pm\mathrm{Pm}Pm Choose the correct answer from the options given below :
  1. A
    B and D only
  2. B
    A and BBB only
  3. C
    CCC and D\mathrm{D}D only
  4. D
    A and E only
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