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Q.

The electronic configuration of Thorium is

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a

$[R n] 5 f^{6} 7 s^{2}$

b

$[R n] 6 d^{2} 7 s^{2}$

c

$[R n] 6 d^{5} 7 s^{2}$

d

$[R n] 5 f^{10} 7 s^{2}$

answer is B.

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$[R n] 6 d^{2} 7 s^{2}$

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