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$5 f$ -subshell is filled by electron(s) :

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before filling of electron in 6d series

In actinides

all are correct

after filling of 7s-subsbell

answer is D.

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Detailed Solution

$7 s^{2} 6 d^{0 - 1} 5 f^{0 - 14}$

There is one s orbital, three p orbitals, five d orbitals, and seven f orbitals in actinides.
This 5f subs heel appears after the filling of the 7s-subsbell. In the 6d series, it also comes before the electron filling.

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