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The calculated electron gain enthaly ...

The calculated electron gain enthaly values for alkaline earth metals and noble gases are positive . How can you explain this ?

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(1) positive electron gain enthalpy means that energy needs to be supplied so that the electron can enter the atom . But if the electron gain enthalpy is negative then it means that energy is relased by the atom while taking in the electron .
(2) Alkaline earth metals have tendency to lose electrons not gain electrons and noble gases are stable . So , they will not accept to gain electron . hence additional energy is required to add electron to them .
(3 ) Hence , they have postive electron gain enthanlpy values .
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