Across
- 4. poor conductors of heat, brittle
- 5. all have full outer shells
- 7. what is left after a reaction
- 8. Russian chemist that formulated periodic law
- 11. smallest piece of an atom in an element
- 12. have the same amount of shells
- 13. states that any matter can be changed but the mass will never change
- 16. cold reaction where energy is being absorbed
- 19. space outside the nucleus where electrons may exist
- 20. the mass of an atom
- 22. what we put into a reaction
- 23. reaction where a layer of metal is bonded to the surface of another substance
- 25. shorter name for an element
Down
- 1. pure substance that's made of 2 or more different kinds of atoms
- 2. particles with no charge
- 3. mix of metal and non metal
- 6. center of an atom
- 9. smallest particle in element or compound
- 10. electrons in the outermost orbital
- 14. how many protons and electrons an element has
- 15. negatively charged particles
- 17. hot reaction where energy is being released
- 18. pure substance that has one kind of atom
- 21. solid, shiny, good conductors of heat
- 23. positively charged particles
- 24. all have the same amount of valence electrons