| A | B |
|---|
| Bohr's Theory | electrons are found in energy levels around the nucleus |
| Dalton's Theory | father of the atomic theory |
| Chadwick's Theory | neutrons are found in the nucleus and are neutral |
| Rutherford's Theory | nucleus is the positive center of an atom |
| Thomson's Theory | "Plum pudding Atom"- the electrons are scattered within a positive material |
| Proton | positive particle in the nucleus |
| element | substance that cannot be broken down into a simpler substance by ordinary chemical means |
| Atomic Mass | proton and neutron number of an atom |
| Spectrum | "fingerprint" of an element produced when electrons fall back to the original level |
| Neutron | neutral particle in the nucleus |
| Atom | smallest part of an element that retains all the properties of the element |
| Electron | negatively charged particles |
| Isotope | an atom with a different physical property because the neutron number has been changed |
| Atomic Number | proton number of an atom |
| energy level | Assigned location for electrons |
| Electron | negatively charged particles |
| Ion | a charged atom tha forms when the electron number is changed |
| excited state | when energy is added to an atoms electrons and they jump to higher energy levels |
