CBSE Class 11-science Answered
I have found that as we go down the group 18(noble gases), the electron gain enthalpies of the elements become less and less positive in general. But i think they should be more and more positive since this is the general trend in the periodic table. Can you please help me sort out this confusion?
Asked by kumar.ashlesha | 25 Jun, 2016, 08:03: PM
Expert Answer
Noble gases have large positive electron gain enthalpy because electron has to enter next higher principle quantum level leading to a very unstable electronic configuration.
The electron gain enthalpy decreases down a group as increase in the size of the atom and also the added electron would be further away from the nucleus.
Answered by | 04 Jul, 2016, 06:15: PM
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