Across
- 2. The tiny building block of all matter.
- 4. Ancient Greek who first thought of the "atom" idea.
- 7. positive center of an atom
- 8. A tiny particle with a negative charge.
Down
- 1. Something that is impossible to divide or exhange further.
- 3. someone who discovered electrons and proposed the "plum pudding" model.
- 5. someone who proved atoms exist and created the first atomic theory.
- 6. someone who discovered the nucleus using his gold foil experiment.