Across
- 2. The smallest unit of matter
- 5. Atoms with an unequal amount of protons and electrons
- 6. An atom with more or less neutrons than it should have
- 7. The center of the atoms made up of protons and neutrons
- 9. Matter that can be separated by physical means
- 10. Pure substances made up of identical atoms
- 11. Pure substances made up of molecules
Down
- 1. Table What are the elements organized in?
- 3. The russian chemist who formulated the periodic table
- 4. Particles with negative charge
- 7. Particles with neutral or no charge
- 8. Particles with a positive charge