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atom a small particle that is the building block of matter
compound a substance made of two or more elements that are chemically joined in a specific combination
element a substance made of only one kind of atom
matter anything that has mass and takes up space
mixture matter that can vary in composition
molecule two or more atoms that are held together by chemical bonds and act as a unit
substance matter with a composition that is always the same
heterogeneous a mixture in which two or more substance are evenly mixed
homogeneous a mixture in which two or more substance are evenly mixed, but not bonded together
proton a positively charged particle in the nucleus of an atom
nucleus the region at the center of an atom that contains most of the mas of the atom
neutron an uncharged particle in the nucleus of an atom
ion an atom that has a charge because it has gained or lost electrons
atomic number the number of protons in the nucleus of an atom of an element
Created by: gentrmar2195