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