![]() But the effect of the increase in atomic size is much more pronounced than the nuclear charge. As we move down a group, both the atomic size and the nuclear charge increases. The electron gain enthalpy becomes less negative as we move down a group. Therefore, electron gain enthalpy becomes more and more negative in a period from left to right. So both these factors tend to increase the attraction by the nucleus for the incoming electron. As we move across a period from left to right the atomic size decreases and the nuclear charge increases. ![]() > Electron gain enthalpy across the period:Īs we move from left to right in the periodic table the electron gain enthalpy (its negative value), in the same period, increases. > Atomic size: Electron gain enthalpy is inversely proportional to atomic size, with increase in atomic size, value of electron gain enthalpy decreases. With increase in effective nuclear charge, electron gain enthalpy increases. > Effective Nuclear Charge: Electron gain enthalpy is directly proportional to nuclear charge. Because, in most of the cases atoms release energy, the electron gain enthalpies are negative.įactors on which electron gain enthalpy depends are: ![]() If conditions are not in favor of gaining electrons then the electron gain enthalpy will be less negative.Įlectron Gain Enthalpy: Electron gain enthalpy is the energy required to add an electron in a neutral atom. Hint: Electron gain enthalpy is the energy released due to addition of electrons.
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