Why do transition metals lose 4s electrons first?

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  1. #metals
  2. #according
  3. #orbitals
  4. #principle
  5. #aufbau
  6. #filled
  7. #because
  8. #energy
  9. #first
  10. #lower
  11. #before
  12. #higher
  13. #transition
  14. #sublevel
  15. #electrons