1. Let’s look at metals, non-metals and metalloids
First!
Let’s look at metals, non-metals and metalloids

2. If it touches the line, it is a metalloid,
Alkali Metals
Alkaline
Earth Metals
Transition
Metals
Basic
Metals
Metalloids
Halogens
Nonmetals
Noble Gases
Separation Line
If it touches the line, it is a metalloid,
except for Al, At and Uus
Lanthanide
Actinide

3. Naming Covalent Compounds

4. Ionic vs. Covalent
Ionic Bond – Bond between a metal and a non- metal. Must have anion, and cation!
Covalent Bond – Made of two anions (2 nonmetals or 1 nonmetal & 1 polyatomic ion)

5. Writing Covalent Compounds
Identify the less electronegative element 1st (trend = less EN is the one farthest left & farthest down on Periodic Table)
The 1st nonmetal is just given the name as found on the Periodic Table (just like ionic)
The 2nd nonmetal ending is changed to –ide (just like ionic…don’t change polyatomics)
Difference = numerical prefixes are used to express how many of each nonmetal are present

6. Writing Covalent Compounds (cont.)
You never use “criss-cross” method
The only time you do not use a prefix is when there is only one of the first nonmetal.
Number
Prefix 1
Mono 2 Di 3
Tri 4
Tetra 5
Penta 6
Hexa 7
Hepta 8
Octa 9
Nona 10
Deca

7. Covalent Compound Practice
SO2 N2O NO2 CCl4 Cl2O7 PCl3 SF6 Si3N4 N(BrO3)5 H2O
Sulfur Dioxide Dinitrogen Monoxide Nitrogen Dioxide Carbon Tetrachloride Dichlorine Heptaoxide Phosphorus Trichloride Sulfur Hexaflouride Trisilicon Tetranitride Nitrogen Pentabromate Dihydrogen Monoxide

8. Covalent Compound Practice
Phosphorus Trioxide Dinitrogen Pentacarbide Tellurium Noniodide Carbon Monoxide Selenium Heptaflouride Tetraphosphorous Decoxide Arsenic Hexabromide Silicon Dichloride
PO3 N2C5 TeI9 CO SeF7 P4O10 AsBr6 SiCl2