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La and Ac belong to f-block

An element having atomic number 31 belongs to 3^rd period

General outermost shell configuration of d-block element is $n s^{1 - 2} (n - 1) d^{1 - 10}$

All actinoids are

answer is C.

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Detailed Solution

La and Ac belong to d-block

Element having atomic number 31 belongs to 4^th period.

Elements after $_{92} U$ are ma-made elements.

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