Across
- 1. The positively charged particle found in the nucleus.
- 4. The particle with no electrical charge.
- 7. The scientist who proposed that electrons move in fixed energy levels.
- 8. The building block of matter that cannot broken down by chemical means.
- 9. The center of an atom containing protons and neutrons.
- 10. The negatively charged particle discovered by J.J. Thomson.
Down
- 2. The scientist who discovered the nucleus through the gold foil experiment.
- 3. Discovered in 1803 by John Dalton; atoms are tiny, indivisible and identical element
- 5. An atom is made out of a sphere of positive charges with negatively charged electron embedded in it.
- 6. The scientist who proposed the "plum pudding" model of the atom.