| A | B |
|---|
| Nucleus | center of an atom |
| Molecule | particles that contain MORE THAN ONE atom joined together |
| Electron | particle on the OUTSIDE of nucleus with a NEGATIVE charge |
| Proton | particle in the NUCLEUS of the atom that carries a POSITIVE charge |
| Neutron | particle in the NUCLEUS of an atom that carries a NEGATIVE charge |
| Atom | SMALLEST unit of an element that retains properties of that element |
| Element | PURE substance that CANNOT be broken down |
| Compound | Substance that is formed by chemical COMBINATION of TWO OR MORE elements |
