| A | B |
|---|
| Atom | The building block of matter |
| Matter | Anything that has mass and takes up space |
| State of matter | The form that matter takes--solid, liquid, or gas |
| Electron | A negatively, charged particle of an atom that moves around the nucleus |
| Neutron | An uncharged particle in the nucleus of an atom |
| Nucleus | The central part of an atom |
| Proton | A positive charged particle in the nucleus of an atom |
| Element | Matter that has only one kind of atom |
| Natural element | An element that is found in nature |
| Symbol | One or two letters that represent the name of an element |
