Across
- 3. smallest unit of a element
- 4. first person to discover atoms
- 7. the vertical column
- 9. the horizontal row are called periods are labeled
- 10. negative charge in the nucleus
- 11. when more then one atom chemically combined
- 12. two or more types of elements chemically combined
- 13. alters the form of a substance
- 15. a characteristics that enables a substance to undergo a chemical change
- 17. the substance you start out with
- 18. neutral in the nucleus
Down
- 1. the substance you end with
- 2. states that in a chemical reaction,matter is neither created nor destroyed
- 3. the number of protons & neutrons found in the nucleus
- 5. chemical reaction also involves energy
- 6. the changes when an element is put together or pulled apart
- 8. a substance that is made up of only one kind of a atom
- 14. not cuttable
- 16. positive charge in the nucleus
- 19. center of an atom