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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