|Fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) are ____.
|During chemical reactions, reactants are converted to ____.
|Protons, neutrons, and electrons are composed of ____.
|A spoonful of table salt (NaCl) is composed of two ____.
|The horizontal rows in the periodic table are called ____.
|At STP, equal volumes of gases have an equal number of ____.
|Atoms can be joined together by ____ to form molecules.
|Metals are good ____ of heat and electricity.