| Atoms can be joined together by ____ to form molecules. |
anions |
| Heterogeneous ____ can be separated by physical means. |
bonds |
| Na and Cl are the ____ for sodium and chlorine. |
cations |
| When neutral atoms gain electrons, ____ are formed. |
mixtures |
| At STP, equal volumes of gases have an equal number of ____. |
molecules |
| During chemical reactions, reactants are converted to ____. |
neutrons |
| The isotopes of an element have different numbers of ____. |
products |
| When neutral atoms lose electrons, ____ are formed. |
symbols |
