The following three problems are about the following situation: Each element is

Question

The following three problems are about the following situation: Each element is in its ground state energy level. Determine what is a possible set of quantum numbers (n, l, ml, ms) for the outermost electron.

1)  Helium

(1, 0, 0, +1/2)

(1, 1, 0, +1/2)

(1, 0, 1, +1/2)

(1, 1, 0, -1/2)

(1, 0, 1, -1/2)

2)  Oxygen

(2, 0, 1, +1/2)

(2, 0, 1, -1/2)

(2, 1, -1, +1/2)

(2, 0, -1, +1/2)

(2, 0, -1, -1/2)

3)  Calcium

(3, 1, 0, +1/2)

(3, 1, 1, +1/2)

(4, 2, 0, +1/2)

(4, 2, 1, +1/2)

(4, 0, 0, +1/2)

As of now I chose

1) A

2) C

3) E

but am not sure if that is correct and want to check. Thanks

Explanation / Answer

1) for helium the configuratuion is 1s2 so the n = 1; l = 0; ml = 0; ms =+1/2 or -1/2.

so answer is A

2) for oxygen the configuration is 1s2 2s2 2p4..so for outermost electron n =2; l = 1; ml can be -1,0, +1; and ms can be +1/2 or -1/2.

so the answer is C

3) for calcium the configuration is 1s2 2s2 2p6 3s2 3p6 4s2 so for outer most electron n=4, l=0 , ml=0, and ms can be +1/2 or -1/2.

so the answer is : E

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