00:02
Hi there.
00:03
To pick the correct answer for an electron in a 4p orbital, we need to first talk about the quantum numbers and their possible values and what they mean.
00:14
So for the first quantum number, the principal quantum number, this is the energy level.
00:24
And it is any positive integer.
00:30
But that integer corresponds to the energy level.
00:35
Okay, the next quantum number, the angular momentum quantum number describes the subshell.
00:42
It's an integer that ranges from 0 to n minus 1.
00:59
So if n were 3, for example, l could be 0, 1, or 2.
01:04
Furthermore, when l equals 0, we have an s orbital.
01:08
When it equals 1, it's a p orbital.
01:12
When it equals 2, it's a d.
01:14
And when l equals 3, that describes an f orbital.
01:19
All right, the magnetic quantum number m subl, that's the orbital's orientation in space, it also must be an integer, but it ranges from negative l to positive l.
01:39
All right.
01:40
And finally, the spin quantum number, that describes the electron itself in its spin.
01:45
It can only have one of two possible values, either positive one -half or negative one -half...