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