AP BIOLOGY

Detailed explanation-1: -When you are asked to find bond polarity, you should compare electronegativity values of each bonding atom to the central atom. Will PH3 be polar or nonpolar based on the electronegativity difference and the shape?

Detailed explanation-2: -The polarity of a covalent bond can be judged by determining the difference in the electronegativities of the two atoms making the bond. The greater the difference in electronegativities, the greater the imbalance of electron sharing in the bond.

Detailed explanation-3: -The difference in electronegativity between two atoms determines how polar a bond will be. In a diatomic molecule with two identical atoms, there is no difference in electronegativity, so the bond is nonpolar or pure covalent.

Detailed explanation-4: -In general the electronegativity difference must be 0.5 or more before the bond is labeled as a polar covalent bond instead of nonpolar covalent bond. The relationship between electronegativity difference (