First slide

Electronic configuration of Actinoids

Question

Number of ‘d’ electrons in thorium are

Difficult

A

32
B

2
C

31
D

1

Solution

${}_{90}{Th} 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6} 6 s^{2} 4 f^{14} 5 d^{10} 6 p^{6} 7 s^{2} 5 f^{0} 6 d^{2}$ OR $[Rn] 5 f^{0} 6 d^{2} 7 s^{2}$
In Thorium, electrons are not present in 5f orbital hence total number of f-electrons are 14 only;
It has two ‘6d’ electrons and 32 ‘d’ electrons;

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