Across
- 3. subatomic particle with no charge
- 7. element with different number of neutrons
- 8. aka Lewis Dot Diagram;shows the symbol for the element & the valence electrons
- 11. smallest basic unit of matter
- 12. number of protons
- 13. takes up most space in atom where electrons are
Down
- 1. center of atom with protons & neutrons
- 2. average of all isotopes (or mass numbers) of an element
- 4. shows protons & neutrons in the nucleus & electons in the shells
- 5. subatomic particle with negative charge
- 6. horizontal rows on Periodic Table that have the same number of elctron shells
- 9. aka family; vertical columns on Periodic Table that have the same number of valence electrons
- 10. number of protons & neutrons for a specific isotope