NEET2016Chemistry-Periodic Table
NEET 2016 Chemistry Electronic Configuration MCQ Question
Type: MCQ-conceptual-Hard-Class 11
The electronic configurations of Eu (atomic no. 63), Gd (atomic no. 64) and Tb (atomic no. 65) are ______, respectively.
A
[Xe] 4f⁷ 6s², [Xe] 4f⁷ 5d¹ 6s², [Xe] 4f⁸ 5d¹ 6s²
B
[Xe] 4f⁷ 5d¹ 6s², [Xe] 4f⁷ 5d¹ 6s² and [Xe] 4f⁹ 6s²
C
[Xe] 4f⁷ 6s², [Xe] 4f⁸ 6s² and [Xe] 4f⁸ 5d¹ 6s²
D
[Xe] 4f⁶ 5d¹ 6s², [Xe] 4f⁷ 5d¹ 6s² and [Xe] 4f⁸ 6s²
Correct Answer
Option A
Detailed Explanation
Europium has a configuration ending in 4f⁷ 6s², gadolinium has 4f⁷ 5d¹ 6s², and terbium has 4f⁸ 5d¹ 6s².
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