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S8P1.a
Distinguish between atoms and molecules
| Term | Definition |
|---|---|
| Atom | The smallest unit of an element expressed in atomic mass units. |
| Element | A substance that can't 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 element |
| Neutral | having no overall change. |
| Atomic mass | the mass of an atom expressed in atomic mass unit. |
| Chemical Symbol | a one or two letter code that represents an element. |