Across
- 1. A neutrally charged subatomic particle located in the nucleus.
- 5. Cherry with a pit theory
- 7. Greek philosopher
Down
- 2. Chocolate chip cookie theory
- 3. Solar system theory
- 4. A positively charged subatomic particle located in the nucleus.
- 6. Billiard ball theory
- 8. A negatively charged subatomic particle located outside the nucleus.