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S8P1.a
Distinguish between atoms an 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 atoms 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. |
| 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 charge. |
| atomic mass | The mass of an atom expressed in atomic mass units. |
| chemical symbol | A one- or two- letter code that represents a element. |
| neutron | A subtomic particle that has no change |