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Matter
| Term | Definition |
|---|---|
| molecule | a group of two or more atoms bound together by chemical forces, forming the smallest unit of a pure substance |
| nucleus | the small, dense core located at the center of an atom, containing more than 99.9% of the atom's mass |
| proton | subatomic particle that has a POSITIVE charge and is found in the nucleus of an atom |
| neutron | subatomic particle that has a NEUTRAL charge and is found in the nucleus of an atom |
| electron | subatomic particle that has a NEGATIVE charge and is found outside of the nucleus of an atom |
| chemical symbol | standardized, one- or two-letter shorthand abbreviation used to represent a chemical element on the Periodic Table |
| chemical formula | a shorthand symbolic representation of a chemical compound or molecule that uses element symbols from the periodic table and numerical subscripts to show the types and proportions of atoms present |
| chemical equation | a shorthand symbolic representation of a chemical reaction |
| atomic number | the total number of protons found in the nucleus of an atom |
| atomic mass | the total quantity of matter—or the mass—contained in a single atom of an element. |
| mass number | sum of the protons and neutrons in the nucleus of an atom |
| chemical reaction | a process where one or more starting substances are converted into different new substances through the breaking and forming of chemical bonds |
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