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Q.

Which one of the following is an electronic configuration of thorium?

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a

$[Rn] 5 f^{2} 6 d^{0} 7 s^{2}$

b

$[Rn] 5 f^{1} 6 d^{1} 7 s^{2}$

c

$[Rn] 5 f^{0} 6 d^{2} 7 s^{2}$

d

$[Rn] 5 f^{2} 6 d^{2} 7 s^{2}$

answer is C.

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Detailed Solution

Thorium (Z = 90) have $[Rn] 5 f^{0} 6 d^{2} 7 s^{2}$ configuration.

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