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| Term | Definition |
|---|---|
| Atom | The smallest unit of an element that maintains the properties of that elements. |
| Element | a substance that cannot be separated or broken down into simpler substances by chemical means |
| Nucleus | In physical science, an atom's central region, which is made up of protons and neutrons. |
| Proton | A subatomic particle that has a positive charge and that is found in the nucleus of an atom. |
| Neutron | A subatomic particle that has no charge and that is found Hin the nucleus of an atom. |
| Electron | A subatomic particle that has a negative charge |
| Atomic Number | The number of protons in the nucleus of an atom: the atomic number is the same for all of an element. |
| Neutral | Having no overall charge. |
| Atomic Mass | The mass of an atom expressed in atomic mass units. |
| Chemical Symbol | a one-or two-letter code that represents an element. |