Across
- 1. The element with the symbol Al
- 3. smallest particle
- 4. Dalton leader of atomic theory
- 6. Positively charged particle
- 7. How many electrons can fit on the second outer shell
- 9. The table organised by atomic number
Down
- 2. Neutral particle in the nucleus
- 5. first element on the periodic table
- 6. type of charge a proton has
- 8. what h2o stands for