Across
- 2. has a positive charge
- 8. one of a class of substances that cannot be separated into simpler substances by chemical means.
- 10. is made up of two elements
- 14. has three proton
- 17. atomic symbol Rn
- 19. 18 of them in the periodic table (how the elements are seperated)
- 20. has 29 proton
- 21. atomis mass of 65.39
Down
- 1. 7 of them in the periodic table (used to seperate the elements)
- 3. is neutral
- 4. letter that represents the element
- 5. atomic number 1
- 6. has a negative charge
- 7. atomic number of 2
- 9. has 80
- 11. has 8 proton
- 12. atomic mass of 32.06
- 13. atomic symbol of Ag
- 15. good conductor of electricity.
- 16. atomic symbol Au
- 18. number/ number of proton in the element