Question

. What do you understand by the term 'electron gain enthalpy'? Explain its variation in the periodic table by
providing suitable examples.
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Answer 1

Answer:

Electron gain enthalpy of an element is the energy released when a neutral isolated gaseous atom accepts an extra electron to form the gaseous negative Ion i.e. anion. We can denote it by Δ egH. Greater the amount of energy released in the above process, higher is the electron gain enthalpy of the element.

Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. During the addition of an electron, energy can either be released or absorbed. Let us consider two metals Magnesium and Sodium. ... Hence, electron gain enthalpy for metals will be positive.