| A | B |
|---|
| Atomic Number | Number of protons in an atom's nucleus |
| Proton | Positive particle within the nucleus of an atom |
| Neutron | A particle that has no charge within the nucleus of an atom |
| Electron | A particle that has a negative charge within an atom |
| Element | substance with atoms that are alike |
| Compound | Substance formed from two or more elements in which the exact combination and proportion of elements is always the same |
| Heterogenous Mixture | mixture, such as mixed nuts, in which different materials are unevenly distributed and are easily identified |
| Homogenous Mixture | solid, liquid, or gas that contains two or more substances blended evenly throughout |
| Atom | The smallest particle of an element that still retains the properties of the element |
| Electron Cloud | area around the nucleus of an atom where the atom's electrons are most likely to be found |
| Atomic Mass | The number of protons and neutrons in an atom |
