what is positive nd negative electron gain enthalpy
Electron Gain Enthalpy or Electron Affinity is the amount of energy released when an isolated, neutral, gaseous atom takes up an extra electron to form uninegative gaseous ions. X(g) + e− ----→ X− ; Δ H = Δ eg .
Negative value of electron gain enthalpy denotes that energy is given out and a positive value denotes that energy is absorbed when an electron is gained by an atom.