Across
- 6. protons plus neutrons.
- 8. section of the periodic table towards the center of the periodic table. _______ metals
- 11. periodic table member under hydrgen.
- 13. symbol for gold.
- 14. element above silicon
- 17. the verticle columns.
- 20. atoms of the same element with different numbers of neutrons.
- 21. name of element with an atomic number of 1.
Down
- 1. name of element represented as "K".
- 2. element at period 3, group 16.
- 3. group 1 on the period table. _____ metals.
- 4. number of protons; shown the periodic table.
- 5. most top, right element.
- 7. letter(s) used to represent an element.
- 9. abbreviation for atomic mass unit.
- 10. table of elements. ______ table.
- 12. weighed averages of all the different number of neutrons. atomic ______
- 15. symbol for silver.
- 16. group that contains helium. ____ gasses.
- 18. the horizontal rows.
- 19. goup 13 on the periodic table. _____ group.