Noble gases have large positive electron gain enthalpies. Why?
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electron gain enthalpyof 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 ∆i.e. H . Greater the amount of energy released is the above process ,higher is electron gain enthalpy of the element.
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Noble gas has stable electronic configuration .. so they don't want to add any electron .....
Electron gain enthalpy is the energy released when an electron is added to any atom.As noble gas has stable electron configuration we have to give external energy to that noble gas ..instead of release of energy they are provided energy so their electron gain enthalpy is positive
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