Q.

Number of ‘f’ electrons in thorium are

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a

14

b

16

c

Zero

d

15

answer is A.

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Detailed Solution

Th 90  1s22s22p63s23p64s23d104p65s2 4d105p66s24f145d106p67s25f06d2    OR     Rn 5f06d27s2In Th electrons in 5f orbital  are not present and hence total number of f-electrons are 14
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