Which of the following is not an actinid...

Which of the following is not an actinide?

Curium

Californium

Uranium

Terbium/Erbium

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The correct Answer is:

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

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