atom - mass, length, volume, temperature, density, matter - an aggregate of at least two atoms in a definite arrangement held together by chemical forces, mixture - a basic unit of element that can enter into chemical combination, element - a matter that has a definite or constant composition and distinct properties., properties - a combination of two or more substances in which the substances retain their distinct identities, molecule - an international system of units which is a revised metric system., periodic table - is anything that occupies space and has mass., SI - a substance that cannot be separated into simpler substances, substance - a chart in which elements are grouped together.,

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