1. Writing and Naming Binary Molecular Compounds Composed of two anions (binary) Check on periodic table to make sure! Name describes the type and number of the atoms in a molecule of the compound.

2. The most metallic (farthest left element or lowest) is written 1st. Write the second element changing the ending to -ide. Be sure to place Greek prefixes before each element to indicate the actual number of atoms in the molecule. Never simplify! Note: Never place “mono” on the first element

3. Greek prefixes 1- mono 2- di 3- tri 4- tetra 5- penta 6- hexa 7- hepta 8- octa 9- nona 10- deca

4. CO carbon monoxide CO 2 carbon dioxide N 2 O 5 dinitrogen pentoxide SF 3 sulfur trifluoride

5. Molecular Names to Formulas Disulfur heptachloride Xenon trioxide

6. Dinitrogen tetroxide Sulfur hexachloride Carbon disulfide Oxygen difluoride