Chapter 10 in Review

Electronegativity and polarity: 

• When two nonmetal atoms of different electronegativities form a covalent bond, the electrons in the bond are not evenly shared and the bond is polar.
• In diatomic molecules, a polar bond results in a polar molecule.
• In molecules with more than two atoms, polar bonds may cancel, forming a nonpolar molecule, or they may sum, forming a polar molecule.