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Manipal MET2013ChemistryStructure of Atom

What are the four quantum numbers of 19 th electron in Sc (Z=21) ?

Options

  1. An=4, l=0, m=0, m_s=+ 1 2
  2. Bn=3, I=1, m=-1, m_s=+ 1 2
  3. Cn=4, l=1, m=+1, m_s=- 1 2
  4. Dn=3, l=2, m=+2, m_s=- 1 2

Correct answer

A. n=4, l=0, m=0, m_s=+ 1 2

Step-by-step solution

Sc (21)=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^1 s^2 19th electron goes into 4 s Hence, n=4l=0 , m=0, m_s=+ 1 2

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