Across
- 3. number of protons
- 6. determines the elements reactivity
- 7. has a charge of 0
- 9. have similar chemical properties
- 11. is located in the center of an atom
- 12. has a negative charge
- 13. where electrons are located
- 16. Average mass of all isotopes (varieties) of that element
- 17. determines how many energy levels an atom has
- 18. full outer shell,low reactivity,all part of group 8
- 19. bottom left corner
- 20. charged atoms
Down
- 1. high shine,good conductor,malleable
- 2. calculated by mass#-atomic#
- 4. determines the # of electrons in elements outer shell
- 5. positive charge
- 8. forms between two nonmetals atoms of the same element
- 10. shares properties of both metals and nonmetals
- 14. of elements are called periods
- 15. dull,low shine,poor conductor,breakable