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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 change 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 |
| atomic mass | the mass of an atom expressed in atomic mass unit |
| chemical symbol | a one- or two-letter code that represents an element |