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S8P1.a
Distinguish between atoms and molecules
| Term | Definition |
|---|---|
| Atom | the smallest unit of an element that maintains the properties of that element |
| 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 in 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 atoms of an number |
| Neutral | having no overall change |
| Atomic mass | the mass of an atom expressed in atomic mass units |
| Chemical symbol | a one- or two-letter code that represents an element |