| A | B |
| Ion | Atom that has either a positive or negative charge |
| Ionic Bond | Ions are held together by their strong attractions of their opposite charges |
| Ionic Compound | Two or more ions held together by their electrical attraction |
| Isotope | One of a group of atoms of an element with the same number of protons and electrons but different numbers of neutrons |
| Mass | Amount of material |
| Matter | Anything that has mass and takes up space |
| Molecule | Smallest particle of a substance that has all the properties of the substance |
| Neutral Solution | pH 7- neither an acid nor a base |
| Neutron | Tiny particle in the nucleus of an atom, Same mass as the proton and no electrical charge |
| Nucleus | Atom's center, Made of protons and neutrons |
| Organization | Arrangement of parts |
| pH | Number which tells whether a substance is an acid or a base |
| Physical Property | Characteristic of a substance or an object that can be observed without changing the substance into a different substance |
| Polar Molecule | Molecule with an uneven distribution of electron density |
| Product | Substance that is formed in a chemical reaction |
| Proton | Tiny particle in the nucleus of an atom, Positive electrical charge |
| Radical | Two or more atoms that act like one atom |
| Radioactive | Element that decays to form another element |
| Radioisotope | Radioactive Isotope |
| Reactant | Substance that is altered in a chemical reaction |
| Solvent | Substance capable of dissolving one or more other substances |
| Subatomic Particle | Proton, neutron, electron, or other particle smaller than the atom |