| A | B |
|---|
| Atom | The smallest unit of an element with the properties of the element |
| Molecule | Two or more atoms covalently combined; can be the same or different elements |
| Nucleus | The location of protons and neutrons |
| Electron Cloud | The area of highest probability for the presence of electrons |
| Electron | A negatively charged subatomic particle |
| Ion | A "charged" atom |
| Ionic Bond | The attraction between a negative and a positive ion |
| Covalent Bond | Two atoms sharing a pair of electrons form this. |
| Isotopes | Two atoms with the same atomic number but different atomic mass |
| Polar Covalent | A bond formed when electrons are shared unequally by two or more atoms |
| Neutron | A subatomic particle with no electrical charge |
| Proton | A positively charged subatomic particle |
| Element | A substance made of only one type of atom |
| Compound | A substance made of two or more elements chemically combined |
| Atomic Number | The number of protons in the atoms of an element |
| Hydrogen Bond | The type of attractive bond between water molecules |
| Atomic Mass | This equals protons + neutrons |
| Acid | A solution that releases hyudrogen ions (H+) in water |
| Base | A substance that releases hydroxyl ions (OH-) in water |
| Buffer | A substance that maintains the pH of a solution |
| Radioisotopes | Atoms that cannot hold their nuclei together; shoot out particles |
| Medical imaging | One use for radioisotopes |
