1.

Which of the noble gases has the maximum positive `Delta_(eg)H`?A. `He`B. `Ne`C. `Ar`D. `Kr`

Answer» Correct Answer - B
`Delta_(eg)H` becomes less and less positive from `Ne` onwards on account of increase of atomic size. Unusulaly low positive `Delta_(eg)H` for `He` is related to its very small size which leads to relatively greater attraction towards the nucleus. The correct order of decreasing positive `Delta_(eg)H` is
`Negt Argt Kr gt Xegt Rn gt He`


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