## 2.29 b & d

Megan Potter 1G
Posts: 35
Joined: Fri Apr 06, 2018 11:04 am

### 2.29 b & d

How many electrons can have the following quantum numbers in an atom:
b) n=4, l=2, ml=-2
d) n=3, l=2, ml=+1

So for these I understand (using b for example) n=4 and l=2 would be the 4d orbital, and the values of ml could be -2, -1, 0, +1, and +2 (so 5 orbitals). I'm confused though on what exactly ml is, and if it specifies a certain ml how does that change the number of electrons?

Alexander Hari 1L
Posts: 30
Joined: Wed Feb 14, 2018 3:02 am

### Re: 2.29 b & d

ml is the possible number of electrons, the reason it has 5 possible values (-2, -1, 0, 1, 2) is because we don't know exactly how many electrons there are.

Megan Potter 1G
Posts: 35
Joined: Fri Apr 06, 2018 11:04 am

### Re: 2.29 b & d

so if ml is -1, then that means 2 electrons because the ml is specified? whereas with 2p, for example, the n=2 and l=1, which gives ml=-1, 0, +1 and each of those could have 2 electrons, right? which then ties in with why the p-orbital fills with 6 electrons? If someone could confirm this or explain in a better way than me then I think I understand

Chem_Mod
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### Re: 2.29 b & d

ml is the magnetic quantum number. It distinguishes the different subshells (so different 4d orbitals).