3. Refer to the periodic trend of the electronegativity of elements; list the following bonds in order of decreasing polarity. Identify the positive pole, if any.
F - F, P - O, N - O
4. Refer to the periodic trend of the electronegativity of elements, rank the percent ionic character of the bond between the following pairs of atoms from the lowest to the highest.
C - O, C - F, Na - O, Na - N, and Na - F
