## ml in quantum numbers

SamayaJoshi1A
Posts: 63
Joined: Wed Sep 30, 2020 9:37 pm

### ml in quantum numbers

Can someone explain to me what the ML quantum number is referring to and how it related to the spin of the electron.

Thanks!

Nayra Gharpetian 3F
Posts: 66
Joined: Wed Sep 30, 2020 9:40 pm
Been upvoted: 1 time

### Re: ml in quantum numbers

Hi ml is referring to the orientation of the angular momentum, (like px, py, pz). Each orientation also refers to an orbital in a subshell. For example, px may refer to the first orbital of the p block. This relates to the spin of an electron because since there are two electrons in each orbital, each electron will either be spin up or spin down. I'm not sure if that made sense and please feel free to correct me if i made any mistakes :)

Ashley Ko 3I
Posts: 71
Joined: Wed Sep 30, 2020 9:54 pm

### Re: ml in quantum numbers

Hi! So, the quantum number, ml, refers to a specific orbital. It is related to l in that the range of ml is -l to +l. For example, if l = 2, then the ml can be -2, -1, 0. +1, or +2 (this makes sense since l = 2 refers to the d-subshell, which has 5 orbitals). As for electron spin, every orbital has a maximum of 2 electrons that have opposite spins. For instance, one electron is +1/2 and the other electron is -1/2. Hope this helps!

Gina Spagarino 3G
Posts: 62
Joined: Wed Sep 30, 2020 9:48 pm
Been upvoted: 1 time

### Re: ml in quantum numbers

ms gives further specification to an electron with a specific ml. So, 2 electrons can have the same n,l, and ml [so same first 3 quantum numbers], but only one electron can have an ms of +1/2, and one electron can have an ms of -1/2. With ms as the fourth quantum number, no electrons have the same 4 quantum numbers.