Across
- 3. number above element
- 5. positively charged
- 6. has neutral charge
- 9. negative charge
- 10. have the same number of valence electrons
Down
- 1. found electron
- 2. theory's of the atom by Dalton
- 4. in between metals and non metals
- 7. different forms of one atom
- 8. have the same number of energy levels