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Question

The lanthanide that would show colour is:

A
Gd3+
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B
La3+
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C
Lu3+
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D
Sm3+
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Solution

The correct option is D Sm3+
The electronic configuration of Gd3+ is [Xe]4f7

The electronic configuration of La3+ is [Xe]4f0

The electronic configuration of Lu3+ is [Xe]4f14

The electronic configuration of Sm3+ is [Xe]4f5

Only Sm3+ among the given options does possess any half-filled or fully filled 4f orbital, hence only Sm3+ would show colour.


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