Across
- 3. thin layer of metal that has been added to the outside of something
- 5. smallest amount of a substance
- 6. number that represents the number of protons in the nucleus
- 7. a combination of molecules
- 9. a substance that changes when combined with another substance
- 11. negative charge, travels around the nucleus
- 12. one or two more electrons on the outer orbital
- 14. a substance that is formed by 2 or more chemicals reacting
- 15. abbreviation of an element
- 16. material that is hard, shiny, malleable and ductile
- 17. rows of elements on the Periodic Table
- 20. has no electrical charge on the nucleus
- 22. mass of an atom
- 23. smallest particle of a substance
- 24. element whose properties are between those of metals and nonmetals
Down
- 1. central part of an atom, is made of protons and neutrons
- 2. Russian chemist and inventor
- 4. states that matter can be changed from one form into another
- 8. column of elements in the Periodic Table
- 10. formed with the absorption of heat
- 13. substance made of atoms of only one kind
- 14. has a positive charge on the nucleus
- 18. element that lacks metallic attributes
- 19. formed with the evolution of heat
- 21. any gas element in group 0(18)