The reaction of a metal, M, with a halogen, X2 , proceeds by
an exothermic reaction as indicated by this equation: M(s) + X2 (g) _ MX2 (s). For each of
the following, indicate which option will make the reaction more exothermic.
Explain your answers.
(a) a large radius vs. a small radius for M+2
(b) a high ionization energy vs. a low ionization energy for
(c) an increasing bond energy for the halogen
(d) a decreasing electron affinity for the halogen (e) an
increasing size of the anion formed by the halogen