Across
- 3. surrounds the nucleaus
- 7. found in the nucleaus
- 11. the number of atoms in an element
- 13. a formula that reveals the elements in a substance
- 14. atoms in the same _ have the same amout of valence electrons
- 15. the number of molecules
- 17. how to measure an elements atomic mass
- 18. a change in size,shape or state of matter
- 19. elements on the _ side of periodic table are very reactive
- 20. has a neutral charge
- 21. found in the electron cloud
Down
- 1. ___ electrons that determine the stability of an element
- 2. located in the center of an atom
- 4. smallest part of an element
- 5. elements on the _ side of the periodic table are stable
- 6. a change where a substance turns into a new substance with new properties
- 8. all atoms that are the same size are in the same ___
- 9. organized table where all the elements are
- 10. proton,nuetron,electron
- 12. stability is another word for it
- 16. how many pieces of evidence we can see with a chemical change