Across
- 4. Discovered the law of conservation of matter
- 5. weighted average mass of an element
- 7. Used cathode ray and discovered electrons
- 8. Discovered atoms
- 11. Chart that organizes the elements
- 13. Anything that has mass and takes up space
- 14. Small particle that makes up matter
Down
- 1. Discovered nucleus and positively charged particles
- 2. Spherical cloud around nucleus that contains electrons
- 3. Protons + neutrons
- 6. Number of protons in an element
- 9. Atoms of the same element that have different numbers of neutrons
- 10. Discovered uncharged particles in nucleus
- 12. Matter made of only one kind of atom