| A spoonful of table salt (NaCl) is composed of two ____. |
anions |
| Na and Cl are the ____ for sodium and chlorine. |
elements |
| The isotopes of an element have different numbers of ____. |
isotopes |
| When neutral atoms gain electrons, ____ are formed. |
molecules |
| Electrons tend to be located in regions called ____ (s, p, d, f). |
neutrons |
| C-12 and C-14 are ____ of carbon atoms. Each has six protons. |
orbitals |
| At STP, equal volumes of gases have an equal number of ____. |
protons |
| All atoms of an element have the same number of ____. |
symbols |
