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How many electron in an atom with atom...

How many electron in an atom with atomic number `105` can have `(n + l) = 8` ?

A

30

B

17

C

15

D

Un - predictable

Text Solution

Verified by Experts

The correct Answer is:
B
For Z = 105, electronic configuration is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(10)4p^(6)4d^(10)5s^(2)5p^(6)4f^(14)5d^(10)6s^(2)p^(6)6d^(3)7s^(2)`
`therefore" "` Number of electrons with `n + l = 8` are 17
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