Across
- 2. good conductors of heat
- 7. Horizontal
- 8. 8 valance electrons
- 11. Positive charge
- 12. what is in the air
- 13. After metals
- 15. Who created the periodic table
- 16. Negative charged ion
- 17. neutron charge
- 18. Gaseous chemical
- 20. A atom with a charge
Down
- 1. outer shell
- 3. First part of water
- 4. from one to another
- 5. the nuber of protons in the nucleus
- 6. positive charged ion
- 9. Negative charge
- 10. 5 protons
- 14. Found in groups1A
- 17. Cells control center
- 19. 18 columns of elements