Atomic theory crossword

3. Scientist known for the gold foil experiment and the discovery of the atomic nucleus.
4. Scientist who developed the atomic theory based on experiments with cathode rays.
9. A model of the atom that represents electrons as a cloud-like region. Known as the _____ model.
10. A model of the atom that suggests electrons move in distinct energy levels. Known as the _____ model.
14. When an atom has an equal number of protons and electrons, it is considered this. Known as a _____ atom.
15. The center of an atom where protons and neutrons are located.
16. The smallest unit of matter that retains its chemical properties.
17. Proposed the "planetary" model of the atom with electrons in specific orbits.
18. Positively charged subatomic particle found in the nucleus of an atom.

1. Proposed the "electron cloud" model of the atom.
2. Proposed the "plum pudding" model of the atom.
5. A scientist who proposed the atomic theory and believed in indivisible atoms.
6. Ancient Greek scientist who came up with the idea of the atom.
7. A tiny, dense region at the center of an atom.
8. A model of the atom that envisions electrons as tiny spheres. Known as the _____ model.
11. Subatomic particle with no charge, found in the nucleus of an atom.
12. A model of the atom that had electrons embedded in a mass of positive "stuff". Known as the _____ model.
13. Subatomic particle with a negative charge that orbits the nucleus.