Science review crossword thing

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Across
  1. 2. creator of the billiard ball model
  2. 6. creator of the nuclear model
  3. 9. special name for group 18
  4. 16. a positive electric charge
  5. 19. the eightieth element of the periodic table
  6. 20. sodium and chlorine and an ionic compound
  7. 21. atomic radius _______ as the energy level increases
  8. 23. the third element of the periodic table
  9. 24. the smallest particle of an element that give the element its properties
  10. 25. a property of metals
  11. 26. carbon and oxygen and a molecular compound
  12. 28. the first element of the periodic table
  13. 29. negative ion
  14. 30. special name for group 17
  15. 31. a property of non-metals
Down
  1. 1. in between metals and non-metals
  2. 3. a neutral electric charge
  3. 4. creator of the planetary model
  4. 5. the outmost energy level
  5. 7. a negative electric charge
  6. 8. special name for group 1
  7. 10. the twelfth element of the periodic table
  8. 11. a group of atom that share electrons
  9. 12. a compound that is made from 2 or more elements sharing electrons
  10. 13. the second element of the periodic table
  11. 14. a _______ is formed when a metal reacts with a non-metal
  12. 15. creator of the plum pudding model
  13. 17. the eleventh element of the periodic table
  14. 18. creator of the periodic table
  15. 22. positive ion
  16. 27. the sixth element of the periodic table