Which of the following sets of quantum numbers could representthe \"last\" elect

Question

Which of the following sets of quantum numbers could representthe "last" electron added to complete the electron configurationfor a ground state atom of Br according to the AufbauPrinciple? Also can you tell me how you decided on what wasright? Thank you!                      n                  l                   ml                  ms a)                 4                0                   0                 -1/2 b)                 4                1                    1                 -1/2 c)                  3                 1                    1                 -1/2 d)                  4                1                   2                 +1/2 e)                 4                2                   1                  -1/2 Which of the following sets of quantum numbers could representthe "last" electron added to complete the electron configurationfor a ground state atom of Br according to the AufbauPrinciple? Also can you tell me how you decided on what wasright? Thank you!                      n                  l                   ml                  ms a)                 4                0                   0                 -1/2 b)                 4                1                    1                 -1/2 c)                  3                 1                    1                 -1/2 d)                  4                1                   2                 +1/2 e)                 4                2                   1                  -1/2

Explanation / Answer

Ground state electronic configuration for Br atomis    [Ar]3d104s24p5 Last electron enters into 4p sub shell, hence n is 4and l should be 1 Only options b) and d) have these values for n andl. If l = 1 the ml has +1 0 -1 so option d) can be omitedas it has ml value 2. option b) is correct                      n                  l                   ml                  ms                     4                1                    1                 -1/2 Last electron enters into 4p sub shell, hence n is 4and l should be 1 Only options b) and d) have these values for n andl. If l = 1 the ml has +1 0 -1 so option d) can be omitedas it has ml value 2. option b) is correct                      n                  l                   ml                  ms                     4                1                    1                 -1/2

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