Across
- 2. vertical column of elements
- 4. has more neutrons than protons
- 6. can increase reaction rate
- 8. uses symbols and numbers to represent a substance
- 11. interaction that holds atoms or ions together
- 14. smallest particle of an element
- 15. total number of protons and neutrons
- 16. poor conductor of heat and electricity
- 18. energy is released
- 19. able to form into shapes
- 20. metals can be made into wire
Down
- 1. group of atoms held together
- 3. formed in a reaction
- 5. the ability to burn
- 7. Mendeleev's arrangement of elements
- 9. energy is absorbed
- 10. identifies the atom
- 12. electrons on the outermost shell
- 13. participants in a reaction
- 17. has 80 protons
- 21. gains or loses electrons