Matter and Atomic theory

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Across
  1. 3. most abundant element in the universe
  2. 4. changing from a solid to a liquid
  3. 5. low kinetic energy
  4. 8. 'split' the atom
  5. 10. outer most electrons
  6. 15. between solid and gas
  7. 17. mistake with atomic number
  8. 19. ...atomic mass
  9. 20. fourth period, group two
  10. 21. aurum
Down
  1. 1. ...number
  2. 2. neutral electronic configuration of 2,8,5
  3. 4. varying substances
  4. 6. anion with electronic configuration of 2,8,8
  5. 7. ...electronic configuration
  6. 9. like a dictionary for chemists
  7. 11. Cf
  8. 12. basic building block of matter
  9. 13. in fixed proportion
  10. 14. 2,8,18,2
  11. 16. large spacing between particles
  12. 18. turning into a gas