Back to Questions
NEET Chemistry
QUESTION #7410
Question 1
Which of the following lanthanoid ions is diamagnetic? (Atomic numbers: Ce = 58, Sm = 62, Yb = 70)
Correct Answer Explanation
Diamagnetic means all electrons are paired (no unpaired electrons).
\(\text{Yb}^{2+}\): Yb (Z=70) = [Xe] 4f¹⁴ 6s². Yb²⁺ = [Xe] 4f¹⁴ → completely filled f subshell → all electrons paired → diamagnetic ✓
Ce²⁺ = [Xe]4f², Sm²⁺ = [Xe]4f⁶, Eu²⁺ = [Xe]4f⁷ — all have unpaired f-electrons and are paramagnetic.
\(\text{Yb}^{2+}\): Yb (Z=70) = [Xe] 4f¹⁴ 6s². Yb²⁺ = [Xe] 4f¹⁴ → completely filled f subshell → all electrons paired → diamagnetic ✓
Ce²⁺ = [Xe]4f², Sm²⁺ = [Xe]4f⁶, Eu²⁺ = [Xe]4f⁷ — all have unpaired f-electrons and are paramagnetic.
Sign in to join the conversation and share your thoughts.
Log In to Comment