Consider the four compounds NF3, NCl3, NBr3, and NI3. Use periodic trends in bond lengths and the
electronegativity table in Chang to answer the following questions: (a) Which molecule is expected to have the longest bonds? (b) Which molecule is expected to have the most polar bonds? (c) Which molecule is expected to have the least polar bonds?
4. Atom hybridization changes in many chemical reactions. In each of the following reactions, determine what change, if any, occurs to the hybridization of the underlined atom.
(a) HN=NH + H2 → H2N-NH2
(b) XeO2 + 1/2 O2 → XeO3