Across
- 1. what is formed after a chemical reaction
- 4. conductor of electricity can be melted
- 6. the mass of an atom
- 8. great stability and low reaction rates
- 11. mass stays the same after a chemical reaction
- 15. basic substance made of atoms
- 17. developed periodic table
- 19. two or more elements to combine
- 21. horizontal row
- 22. part of the nucleus and has no charge
- 23. smallest possible substance
- 25. putting a thin layer of metal over something
Down
- 2. changes when combined
- 3. central part of an atom
- 5. tells how many protons are in an atom
- 7. travels around nucleus and has negative charge
- 9. the electron in the outer most orbital
- 10. part of the nucleus has a positive charge
- 12. produces heat
- 13. lacks characteristics of a metal
- 14. abbreviation of an element
- 16. absorbs heat
- 18. between a metal and a nonmetal
- 20. smallest unit of any amount of matter
- 24. ring of an atom
- 26. column