Which of the following sets of quantum numbers could represent the last electron added to complete the…

Which of the following sets of quantum numbers could represent the last electron added to complete the electron configuration for a ground state atom of Br(Z = 35) according to the Aufbau principle, n ;l ;ml;ms
  1. 4 ;0 ;0 ; -12
  2. 4 ;1 ;1 ; -12
  3. 3 ;1 ;1; -12
  4. 4 ;1 ;2 ; +12

Solution

The valence shell configuration is 4s24p5 and for the last electron n=4, l=1

m= -1, 0 or + 1, s= +12 or -12

Hence, 4, 1, 1, -12

Asked in: JEE-TOPICTESTS-CHEMISTRY

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