Across
- 1. tells you the number of energy levels
- 4. element with symbol C
- 6. element with symbol Fe
- 8. element with atomic number of 2
- 9. positively charge part of an atom
- 12. neutral part of an atom
Down
- 2. negatively charged part of an atom
- 3. element with an atomic mass of 40
- 5. center of an atom
- 7. element in group 1, period 3
- 10. mass divided by volume
- 11. tells you the number of valence electrons