Across
- 5. Positive
- 6. Center of an atom
- 10. negative
- 12. Family
- 13. symbol- abbreviation of element
- 15. atomic theory- atoms can't be divided
Down
- 1. table- Chart of all the elements
- 2. Educated Guess
- 3. Rows in the table
- 4. mass- Average mass of an isotope
- 7. number- number of protons in nucleus of atom
- 8. No charge
- 9. Smallest Particle
- 11. number- sum of protons and neutrons
- 14. Same number of protons and different number of neutrons