Across
- 5. anything that has mass and takes up space
- 6. used the cathode ray tube
- 9. matter cannot be created or ______.
- 12. thought electrons moved like planets around the sun
- 13. used gold foil in his experiment
- 16. discovered the nucleus
- 17. the positively charged particle in the nucleus
- 18. electrons move randomly in energy levels within the electron ________
- 19. he thought atoms were made of only one type of atom
Down
- 1. the uncharged particle in the nucleus
- 2. the French scientist who developed the law of conservation of mass
- 3. discovered the proton
- 4. the first person to use the term "atom"
- 7. the negatively charged particle outside the nucleus of an atom
- 8. Thomson's model of the atom resembles cookie _____.
- 10. discovered the neutron
- 11. small particles that make up matter
- 14. discovered the electron
- 15. the atomic _______ says atoms are made of one type of atom