Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

The alkali metals area highly reactive because their first ionization potential is very low and hence they have great tendency to loses electron from unipositive ion. On moving down group – I from Li to Cs ionization enthalpy decrease hence the reactivity increases. The halogens are most reactive elements due to their low bond dissociation energy, high electron affinity and high enthalpy of hydration of halide ion. However their enthalpy of hydration of halide ion. However their reactivity decrease in atomic number