Atoms

3. Discovered the neutron & worked with Rutherford to created the present day model
7. They gain valance electrons
9. an atom or molecule with a net electrical charge
10. A Greek scientist who believed atoms are small, hard, invisible, and indestructible particles
11. A very small region at the middle of an atom where the protons and neutrons stay
15. A positive charged ion
16. The number of protons in the nucleus of an atom
17. A famous scientist for another unrelated experiment, he came up with a particle cloud theory.
18. Created a boring model based on another pre-existing model
20. Proposed the atomic theory and found multiple atomic weights

1. Didn't create a model but performed the oil drop experiment
2. A form of a chemical element in which the atoms have the same number of protons but with a different number of neutrons
4. Nonmetal atoms that carry one or more negative charges
5. Equivalent to the amount of protons and neutrons in an atom
6. Proposed quantum theory at 23 years old, and proved the previous experiment was true
8. A neutral ion
12. A negatively charged ion
13. Something that is made up of protons, neutrons, and electrons
14. Created the Plum Pudding model and proved that atoms could be divided
19. Conducted the golf foil experiment and discovered the nucleus