1. Electronegativity
-Electronegativity increases from left to right and increases from top to bottom

2. Chemical Bonding
-If the difference in electronegativity is between 0 and 0.5, the bond will be nonpolar covalent
-If the difference in electronegativity is between 0.5 and 2.1, the bond will be polar covalent
-If the difference in electronegativity is between 2.1 and 3.3, the bond will be ionic

3. Chemical Bonding Li – 0.98 F – 3.96
Difference in electronegativity = 2.98
-When an electron from an atom with low electronegativity (like a metal) is removed by another atom with high electronegativity (like a nonmetal), the two atoms become oppositely charged ions that attract, resulting in an ionic bond.