Question

Electron gain enthalpy is endothermic for poly negative anion formation. Plz Explain why?

Answer 1

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➪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.

✫Some Facts about Electron Gain Enthalpy

★ Energy is released when an electron is added to the atom. Therefore, the electron gain enthalpy is negative

★ Noble gases have large positive electron gain enthalpy. This is because the extra electron is placed in the next higher principal quantum energy levels. 

★ The electron gain enthalpy for halogens is highly negative because they can acquire the nearest stable noble gas configuration by accepting an extra electron.

Answer 2

Answer:

It is true that forming anions for given atom is endothermic because the electron affinity only attracts the first electron (through polarisation. All cations take energy to ionise them (the ionisation potential).