| A | B |
|---|
| element | matter that cannot be changed to a simpler form by any ordinary physical or chemical process |
| atom | the most basic units of matter |
| electrons | small negatively charged subatomic particles |
| protons | positive particle with a mass much greater than an electron |
| nucleus | the central region of an atom where neutrons and protons are located |
| neutron | subatomic particle located in the atom's nucleus that has no electrical chrage and that has a mass similar to that of a proton |
| isotope | Atoms of the same element that have different numbers of nuetrons, and therfore different atomic masses |
| compound | A substance made of two or more chemically combined elements |
| molecule | two or more chemically bonded atoms; the smallest part of a compound having all of the properties of the compund |
| ion | an atom or group of atoms having an electric charge as a result of losing or gaining one or more electrons |
| homogeneous mixture | a mixture in which the components are evenly mixed so that every part of the mixture is the same as any other |
| heterogeneous mixture | a mixture in which the components are not evenly mixed so that different parts of the mixture have different components |
