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Manipal MET2014ChemistryChemical Bonding and Molecular Structure

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 ; m_l ; m_s

Options

  1. A4 ; 0 ; 0 ;- 1 2
  2. B4 ; 1 ; 1 ;- 1 2
  3. C3 ; 1 ; 1 ;- 1 2
  4. D4 ; 1 ; 2 ;+ 1 2

Correct answer

B. 4 ; 1 ; 1 ;- 1 2

Step-by-step solution

The valence shell configuration is 4 s^2 4 p^5 and for the last electron n=4, l=1m=-1,0 or +1, s=+ 1 2 or - 1 2 Hence, 4,1,1,- 1 2

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