Hydration enthalpy of halogens’ simple anions

The calculation models for the standard enthalpy of formation of simple anions in a gas phase and an aqueous solution, for the standard enthalpy of anion hydration have been suggested in the study. Possibilities of the models are illustrated by the example of halide ions. Expected calculations of thermochemical characteristics for an astatide-ion have been made. The obtained values for the enthalpies of gaseous anion formation have allowed to calculate the correct values of electron affinity for atomic halogens.