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Which of the following is not an actinid...

Which of the following is not an actinide?

A

Curium

B

Californium

C

Uranium

D

Terbium/Erbium

Text Solution

Verified by Experts

The correct Answer is:
D
Terbium is lanthanide as it belongs to 4f- series having configuration `[Xe] 4s^9 6s^2`. However the remaining members belong to 5f - series (actinides).
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