| A | B |
|---|
| transmutation | when an atom changes into a new element |
| half-life | when half a group of radioactive atoms will decay in a specific time |
| alpha particles | radioactive particle that can be stopped by paper |
| beta particles | radioactive particles that can be stopped by wood |
| gamma rays | radioactive particles that can be stopped by lead |
| Atoms | The building block for all matter |
| Elements | Substances made up of only one type of atom |
| Proton | Part of an atom with a positive charge |
| Electron | Part of an atom with a negative charge |
| Neutron | Part of an atom with a neutral charge |
| Molecule | Two or more atoms joined together |
| Molecules | The smallest part of a substance |
| Chemical Bond | Force that holds two or more atoms together |
| Covalent Bond | Formed when two or more atoms share electrons |
| Ionic Bond | Formed when an atom loses one or more electrons to another atom |
| Reactant | substance that exists before a chemical reaction occurs |
| Product | substance that exists after a chemical reaction occurs |
| chemical equation | shows the reactants, products, and proportions of atoms in a chemical reaction |
| exothermic | chemical reaction that gives off heat |
| endothermic | chemical reaction that absorbs heat |
| Conservation of mass | states that mass cannot be created or destroyed |
