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

Options

A. ` 30`
B. `17`
C. ` 15`
D. unpredictable

Answer

B

Explanation

Electronic configuration of atom with atom with atomic no.
105 is `: 1s^2 . 2s^2 . 2s^2 2s^2 2p^6, 3s^2 3p^6 3d^(10) , 4d^(10), 4s^6 4p^6 4d^(10)`
` 4f^(14), 5s^2 5p^6 5d^(10) underline(5g^(14)), 6s^2 6p^6 underline (6d^3) , 7s^2`
The underline orbitals (5 f and 6d) have ( n +l) =8.