00:03
Hi there.
00:04
In this question, we have a table to complete for the n equals four energy level.
00:13
And when n equals four, or any value of n, we know that l, which tells us the shape of the orbital or the sub -level, l ranges from zero to n -minus one.
00:26
So that's why we have zero, one, two, and three, because n -minus -one is three.
00:30
All right, let's go to m sub l next.
00:35
M sub l is an integer, has to be an integer, and it ranges from negative l to positive l.
00:46
So, for example, when l is zero, all that ml's m sub l can be is zero.
00:52
When l is one, m sub l can be negative 1, zero, or positive 1.
00:59
When l is 2, m sub l can be negative 2, negative 1, 0, 1, or 2.
01:10
And finally, when m subl is 3, or when l is 3, m sub l can be negative 3, negative 2, negative 1, 0, 1, 2, 2, 2, 2, or 2, or 3.
01:25
Okay, so with that in mind, when l is zero, what we have is an s orbital, and we're in the fourth energy level.
01:36
So this is going to be a 4s orbital, and there's only one of those.
01:40
We can see because m sub l, there's only one value for m sub l.
01:47
Next, when l equals one, those are the p orbitals.
01:53
We'll call them 4p because it's energy level 4, and they're the p orbitals.
01:58
So there are three of those...