Our spin QNs are +1/2 and -1/2, yes. Our magnetic quantum numbers are the integers from -l to l. There are two kinds of m; ml, which is the magnetic QN, and ms which is the spin QN.
The magnetic QNs are different because ours go from -l to l, giving us 2l+1 MQNs (or orbitals with the same l values), and theirs go from 0 to l, giving them l+1 MQNs (or orbitals with the same l values).
This i'm not so sure of, since i don't understand their spin quantum numbers. By +1/2, 0, -1/2... does tha "0" mean there can be a orbital that can be empty?
I think the point is that instead of two electrons fitting in a single orbital by the Pauli exclusion principle, three can.
Here's element 24 in this other universe:
1s3 2s3 2p6 3s3 3p6 4s3
The atomic numbers of the first three noble gases would be 3, 12, 21.
The idea you're supposed to be learning is that the number of possible spin quantum numbers equals the maximum number of electrons in an orbital, and the number of possible magnetic quantum numbers equals the maximum number of orbitals of the same principal quantum number n and azimuthal quantum number l (or letter - s, p, d,...)
In our universe we can have two electrons per orbital and 2l+1 orbitals of the same n and l values, while the other universe would have three electrons and l+1 orbitals. So, one s, two p, three d for the other universe.
Does that clear things up?
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