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3 votes
Identify which sets of Quantum Numbers are valid for an electron. Each set is ordered (n,ℓ,mℓ,ms).

3,2,0,1/2
2,2,-1, 1/2
4,3,-4,1/2
1,0,0,1/2
2,2,1,-1/2
3,2,1,1
0,1,1,-1/2
3,3,1,1/2
2,-2,-2,-1/2
3,2,2,1/2
4,2,1,1/2
2,1,-1,-1/2

User TerDale
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1 Answer

3 votes
If the choices are:

a.) 1,3.0,1/2
b.) 3,2,-1,-1/2
c.) 1,0,0,-1/2
d.) 2,1,1,1/2
e.) 2,-2,-2,-1/2
f.) 3,2,0,1/2
g.) 0,2,0,1/2
h.) 2,2,1,1/2
i.) 3,3,-2,-1/2
j.) 4,3,3,-1/2
k.) 4,3,4,-1/2
l.) 3,2,1,1

The "rules" for the quantum numbers are:
* n is the energy shell: n = 1, 2, ...
* ℓ is the subshell, the orbital: ℓ = 0, 1, ... n - 1 (s, p, d etc.)
* mℓ is the specific orbital: mℓ = 0, ±1, ... ±ℓ
* ms is the electron spin: ms = ±½

(n, ℓ, mℓ, ms)

a.) Invalid, ℓ can not be greater than n - 1.
b.) Valid
c.) Valid
d.) Valid
e.) Invalid, ℓ can not be negative
f.) Valid
g.) Invalid, n can not be 0, ℓ can not be greater than n - 1
h.) Invalid, ℓ can not be greater than n - 1
i.) Invalid, ℓ can not be greater than n - 1
j.) Valid
k.) Invalid, mℓ can not be greater than ℓ
l.) Invalid, ms can not be 1
User Rick Rackow
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