1. How Atoms Combine Part 1
Section 7.3 & 7.4

2. How & Why Covalent Compounds Occur
Atoms like to have 8 electrons in their outer ring.
In molecular compounds (two non-metals) the atoms share electrons so that each atoms ends up with 8 electrons in the outermost ring.
The bond that is formed is called a covalent compound.

3. Naming Covalent Compounds
You write the name of the first element and the second element’s ending is changed to “-ide”
We use prefixes to state the number of each element present (never put “mono” on the first element)
One = mono-
Two = di-
Three = tri-
Four = tetra-
Five = penta-

4. Examples Provide names for the following compounds: N2O4
dinitrogen tetraoxide
H2O
dihydrogen monoxide
CO2
carbon monoxide

5. Examples Cont’d Provide formulas for the following names:
nitrogen trihydride
NH3
phosphrous petaoxide
PO5
dicarbon tetraoxide
C2O4

6. Today’s Tasks
Building Molecules Actvity