00:02
Hi there.
00:03
In this question, we want to identify a possible set of quantum numbers for a 4s electron.
00:12
So to determine this, we want to talk about the four quantum numbers briefly.
00:17
The first quantum number n is the principal quantum number, and it describes the energy level.
00:28
So the energy level or the distance from the nucleus is another way to think about it.
00:33
N can be any positive integer.
00:42
Okay, so since n is the energy, level, it's going to correspond to the energy level in our 4s.
00:50
Therefore, n has to be four.
00:55
Okay, next, let's talk about the angular momentum quantum number l.
00:59
This describes the sub -level.
01:06
It also needs to be an integer, but it ranges from zero to n minus one.
01:19
And furthermore, when l equals zero, it describes an s -orbital.
01:24
When l equals one, that would be a p orbital.
01:28
When l equals 2, it's a d.
01:30
And when l equals 3, it's an f orbital.
01:34
Well, we're interested in s.
01:37
This is a 4s orbital.
01:41
So that means l has to be zero.
01:46
Okay, next, let's talk about the magnetic quantum number, m sub l.
01:50
That describes the orientation in space of the orbital...