Across
- 2. symbol of an atomic mass unit
- 3. a positively charged particle
- 6. the smallest particle
- 8. the center of an atom
- 11. another name for period
- 13. Symbol for mass number (has parenthesis)
- 14. another name for metaloid
- 15. a horizontal row of elements
- 16. another name for a group
Down
- 1. a neutral particle
- 4. a region with a lot of electrons
- 5. metals materials that are bad at conducting heat
- 7. for atomic number (has parenthesis)
- 9. an electrically charged particle
- 10. a material that conducts electricity and heat
- 12. a column of elements