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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 atoms central region, which is made up of protons and neutrons. |
proton | a substance 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 |
electon | 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 the atoms of an element. |
neutral | having no overall charge |
atomic mass | the mass of an atom expressed in atomic mass. |
chemical symbol | a one or two letter code that represents an element. |