Across
- 3. this scientist believed electrons orbited the protons in "rings"
- 4. a positively charges particle in an atom
- 5. __________ particles are any particle smaller than an atom
- 9. where electrons move rapidly around the nucleus
- 12. Greek philosopher, the first man to claim atoms existed
- 14. following his experiment, this scientist said an atoms was made up of mostly empty space
- 15. said atoms were indivisible spheres
- 16. atoms are too small to be measured in standard unit so we use _____.
- 17. Bohr believed electrons circled in orbits like ______ on a planet
Down
- 1. neutral particle in the nucleus of an atom
- 2. discovered that atoms contain negatively charged particles (electrons)
- 4. the example/term used to describe JJ Thomson's atomic model
- 6. a tiny, dense center of an atom containing the protons and neutrons
- 7. the number of protons in the nucleus of an atom
- 8. form when atoms of more than one element combine in a specific ratio
- 9. scientist who showed than another particle (neutron) exists
- 10. a negatively charged particle in an atom
- 11. the scientist responsible for the cloud model
- 13. the definition of atomos