Across
- 3. Positively charged subatomic particle located in the nucleus.
- 5. Conducted the gold foil experiment, discovering the dense, positive nucleus.
- 7. Negatively charged subatomic particle orbiting the nucleus.
- 9. Ancient Greek philosopher who believed matter was continuous and composed of four elements: earth, air, fire, and water
- 10. Ancient Greek philosopher who first proposed that all matter is made of indivisible particles called atomos.
Down
- 1. Neutral subatomic particle discovered by James Chadwick in 1932.
- 2. Proposed a model where electrons move in specific, quantized orbits around the nucleus.
- 4. Proposed the solid sphere model, stating that elements consist of indivisible, identical atoms.
- 6. Discovered the electron using cathode ray tubes and proposed the "plum pudding" model.
- 8. Discovered the neutron in 1932, completing the classical model of the atomic nucleus.