What are the quantum numbers for the last electron added to a Fluorine atom (Z=9)?

  • n=2, l=1, m_l=0, m_s=+1/2.
  • n=2, l=1, m_l=-1, m_s=+1/2.
  • n=2, l=1, m_l=0, m_s=-1/2.
  • n=2, l=1, m_l=+1, m_s=+1/2.
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