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2015-03-06T08:08:36+05:30

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Electron gain Enthalpy of irent gases is zero because of it's Stable octate state ie. the valence shells are completely filled
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2015-03-06T09:11:07+05:30

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As noble gas electronic configuration is a stable configuration .Hence it has no need of gain  of electrons to complete its octet .Hence they are inert
and possess positive value of electron gain enthalpy.As a result energy has to be supplied to add an extra electron.
Further as we move down the noble gas family the size of the atom increases and hence E.G.E have lower +ve values.
 

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