Q.

The electronic configuration of an element is Rn7s26d2, the element is

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a

Thorium, d-block element

b

Protactinium, d-block element

c

Actinium, d-block element

d

Thorium, f-block element

answer is D.

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Detailed Solution

Thorium(Z=90) is an actinoid element in which the differentiating electron enters into 6d subshell;Th-Rn7s26d2;Evidence for this fact comes from spectroscopy;
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