Which of the following is not an actinoi

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

Which of the following is not an actinoid?

Options:

Californium

Uranium

Terbium

Cerium

Correct Answer:

Terbium

Explanation:

The valence electrons of the terbium element enter into 4f-orbital so the terbium is not an actinide. It is a lanthanide.

The electronic configuration of the terbium element is as follows: ₆₅Te : [Xe]4f⁹6s².
$[Xe] 4 f^{9} 6 s^{2}$