Question

Which of the following subshell is not possible (4d, 5s, 3f, 5p) *

Answer 1

3f is not possible

Reason:

In the ground state for each energy level:

In the 2nd energy level, electrons are located only in the s and p sublevels, so there are no d orbitals.

In the 1st energy level, electrons occupy only in the s sublevel, so there is no d sublevel.

In the 3rd energy level, electrons occupy only the s, p, and d sublevels, so there is no f sublevel.

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 1s \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: 2s \: \: 2p \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \: \: \: \: \: \: \: \: \: \: 3s \: \: 3p \: \: 3d \\ \: \: \: \: \: \: \: \: 4s \: \: \: 4p \: \: 4d \: \: 4f \\ \: \: \: \: \: \: \: \: \: \: . \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: .$