Question

In: Chemistry

Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,ℓ,mℓ,ms)....

Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,ℓ,mℓ,ms).

Check all that apply.

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

Solutions

Expert Solution

Recall Pauli Exclusion principle, which states that no two electrons can have the same quantum numbers. That is, each electron has a specific set of unique quantum numbers.

Now, let us define the quantum numbers:

n = principal quantum number, states the energy level of the electron. This is the principal electron shell. As n increases, the electron gets further and further away. "n" can only have positive integer numbers, such as 1,2,3,4,5,... Avoid negative integers, fractions, decimals and zero.

l =  Orbital Angular Momentum Quantum Number. This determines the "shape" of the orbital. This then makes the angular distribution. Typical values depend directly on "n" value. then l = n-1 always. Note that these must be then positive integers, avoid fractions, decimals. Since n can be 1, then l = 1-1 = 0 can have a zero value.

ml = Magnetic Quantum Number. States the orientation of the electron within the subshell. Therefore, it also depends directly on the "l" value. Note that orientation can be negative as well, the formula:

ml = +/- l values, therefore, 0,+/-1,+/- 2,+/-3 ... Avoid fractions and decimals

ms = the electron spin, note that each set can hold up to two electrons, therefore, we must state each spin (downwards/upwards). It can only have two values and does not depends on other values,

ms can cave only +1/2 or -1/2 spins. avoid all other numbers. also, avoid 0.5 or -0.5

NOw...

2,1,0,1/2 POSSIBLE
2,2,1,1/2 NOT POSSIBLE SINCE N = L
4,3,3,-1/2 POSSIBLE
4,3,-4,1/2 NOT POSSIBLE SINCE ABS(ML) > L
0,2,0,1/2 NOT POSSIBLE, SINCE N = 0
3,0,0,1/2 POSSIBLE
3,1,1,-1/2 POSSIBLE
2,2,-1, 1/2 NOT POSSIBLE SINCE N = L
2,-2,-2,-1/2 NOT POSSIBLE, SINCE L MUST HAVE INTEGERS
3,2,-2,1/2 POSSIBLE
1,1,0,1/2 NOT POSSIBLE, N = L
3,-2,-1,0 NOT POSSIBLE, MS = 1/2 OR -1/2 NOT 0

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