2.  As the name might suggest (BInary), these compounds contain exactly two elements.  In this class both of these elements will be non-metals.  If a compound is made of exactly two elements and both of them are non-metallic you will use the skills you learn today to name the compound.

3.  Names of binary molecular compounds are NOT to be memorized. They must be figured out. ◦ NO 2 is called nitrogen dioxide. ◦ P 2 O 5 is called diphosphorus pentoxide. ◦ SO 3 is called sulfur trioxide.  Today I will teach you to name these compounds.  NOTE: All are made up of exactly two non- metallic elements.

4.  Look right. You will want to copy this chart down.  These prefix indicate the number of each atom present in a compound.  Rule 1: If the first element has only one atom it receives no prefix. Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

5.  Rule 2: The second atom ALWAYS gets a prefix, even if there’s only one.  CO is called carbon monoxide.  Rule 3: The second atom ALWAYS ends in “ide”. Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

6.  Here’s an example problem: ◦ Name: Sulfur hexafluoride ◦ Symbol SF 6 Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

7.  Here’s another example problem: ◦ Name: Tetraphosphorous decoxide ◦ Symbol P 4 O 10 Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

8.  Here, you try one ◦ Name: Carbon tetrafluoride ◦ Symbol ????? Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

9.  Here, you try one ◦ Name: Carbon tetrafluoride ◦ Symbol CF 4 Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

10.  Try another one: ◦ Name: ??? ◦ Symbol PCl 5 Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

11.  Try another one: ◦ Name: Phosphorus pentachloride ◦ Symbol PCl 5 Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

12.  One last one: ◦ Name: ?????? ◦ Symbol N 2 O Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec

13.  One last one: ◦ Name: Dinitrogen monoxide ◦ Symbol N 2 O Number of atoms Prefix 1mono 2di 3tri 4tetra 5pent 6hex 7hept 8oct 9non 10dec