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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 only one kind of atom.
heterogeneous a mixture in which the substance are not evenly mixed.
homogeneous a mixture in which two or more substance are evenly mixed, but no bonded together.
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
atomic number the number of protons in the nucleus of an atom of an element
electron a negative charged particle that occupies the space in an atom outside the nucleus
electron cloud the region surrounding an atom's nucleus where one or more electron are most likely to be found
ion an atom that has a charge because it has gained or lost electron
isotope one or more of the same protons but different numbers of neutrons.
neutron an uncharged particle in the nucleus of an atom
nucleus the region at the center of the atom.
poton a positively charged particle with a nucelues.
Created by: buffidak7548