Why does the 4s orbital fill before the 3d orbitals?

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Tags

  1. #electrons
  2. #during
  3. #nucleus
  4. #ionization
  5. #energy
  6. #highest
  7. #level
  8. #furthest
  9. #lower
  10. #first
  11. #influence
  12. #orbitals
  13. #filled