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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 substance by chemical means |
| Nucleus | in physical science,an atom central region, which is made uo of protons and neutrons |
| protons | a subatomic particle that has a positive charge and that is found in the nucleus of an atom |
| neutron | a substance 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 |
| 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 |