Across
- 3. with hydrogen they constitute group 1
- 5. positively charged sub-atomic particle
- 9. a column of elements on the periodic table
- 11. same element and different # of neutrons
- 13. large range of complex ions
- 14. atomic numbers 89-103
- 15. occupies group 17 on the table
- 17. a row of elements on the periodic table
- 18. zero-charged sub atomic particles
- 20. up a small portion of the periodic table
- 21. create group 2 on the table
- 22. decay unstable atomic nucleus loses energy
Down
- 1. center of the atom
- 2. negatively charged sub-atomic particle
- 3. the mass of an atom
- 4. makes up most of the periodic table
- 6. ion Ion with a net negative charge
- 7. number the # of protons in an atom
- 8. doesnt undergo chemical reaction
- 10. ion ion with a net positive charge
- 11. Electrons not equal to the protons
- 12. atomic numbers 57-71
- 16. what semiconductors are made of
- 19. atoms spontaneously decay each second