Across
- 4. indicates number or energy levels
- 6. particle that isn't charged and keeps the protons together in the atom
- 7. found on the let side of the periodic table
- 9. found on the right side of the periodic table
- 10. came up with the idea for the model of the atom
- 11. mass divided by volume
Down
- 1. are used for things that are too small or large to be observed or that are too difficult to be understood easily
- 2. indicates number of valance electrons
- 3. positively charged particle in the nucleus
- 5. negatively charged particle 2000x smaller than the protons and neutrons
- 8. cannot be created or destroyed