Across
- 2. not reactive elements
- 3. element series 90-103
- 5. number, the number of protons in nucleus
- 6. elements series 58-71
- 7. atomic mass unit
- 9. horizontal row in periodic table
- 14. groups 3-12
- 15. group 17, combine easily w/ other elements
- 17. an atom that has pos. or neg. electric charge
- 23. positively charged particle in nucleus
- 24. atom releases energy stablizes nucleus
- 25. where an electron could be if measured
Down
- 1. reactive metals than group 1, group 2
- 4. the central region of an atom
- 8. element that has opposite prop. of metal
- 10. neg. charged particle
- 11. atom with diff. # neutrons than a. of same elem.
- 12. element with prop. of both metals and non-metals
- 13. vertical column in periodic table
- 16. very reactive metals, group one
- 18. particle with no electric charge
- 19. change # of protons the element changes
- 20. grows bigger than atom when it gains electrons.
- 21. smaller than atom when it loses electrons
- 22. element that is good conducter of electricity