Across
- 4. neutral particles
- 6. Bohr model of atom
- 7. Positively charged particles
- 8. negatively charged protons
- 11. Chemical reaction is a rearrangement of atoms
Down
- 1. substance consisting of atoms which have the same number of protons
- 2. discovered the electron
- 3. number of electrons
- 5. gold foil experiment
- 7. number of electron shells
- 9. discovered first neutron
- 10. Unit of a Chemical Element