JEE Main 2022 · 28 Jun · Shift 1 · Chemistry Q68

ChemistrySingle correct+4 / -1Question 68 of 90

Which one of the lanthanoids given below is the most stable in divalent form?

Ce (Atomic Number 58)

Sm (Atomic Number 62)

Eu (Atomic Number 63)

Yb (Atomic Number 70)

Answer and worked solution

Official answer: C

$\mathrm{Eu^{2+}}$ is $4f^7$ , a half-filled shell, the most stable divalent lanthanoid ion.

(C)

Topics:Lanthanoids

JEE Main 2022 · 28 Jun · Shift 1, Chemistry question 68