RE-NEET2026Chemistry-f-Block Elements
RE-NEET 2026 Chemistry Lanthanides MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The lanthanide ion having four unpaired electrons is (Given: Atomic numbers of Ce=58, Nd=60, Tb=65 and Ho=67)
A
Ce³⁺
B
Tb³⁺
C
Ho³⁺
D
Nd³⁺
Correct Answer
Option B
Detailed Explanation
Tb³⁺ has 4 unpaired electrons in its 4f orbitals, as its electronic configuration is [Xe] 4f⁸.
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