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