What is electron gain enthalpy? On what factors does it depend?
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Electron gain enthalpy electron affinity is the amount if energy released when an isolated gaseous atom accepts an electron to form a monovalent gaseous anion. It depends on size of atom, effective nuclear charge, screening effect of inner electrons and electronic configuration
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"Electron gain enthalpy:
"Electron gain enthalpy" is termed as the "quantity of energy" liberated when an "electron is added" to an "isolated gaseous atom".
The energy absorbed when an "electron is accepted" is called as "positive electron gain enthalpy".
The energy released when an "electron is accepted" is called as "negative electron gain enthalpy".
It is depending upon the following factor.
- Atomic size - When the size of an atom increases, the value becomes less negative.
- Nuclear charge - As nuclear charge increases, the value becomes more negative.
- Electronic configuration - If elements have half-filled or fully filled electrons, the "electron gain enthalpy" becomes positive. "
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