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Give the decreasing order of Delta(eg)H^...

Give the decreasing order of `Delta_(eg)H^(ɵ)` of the following elements: `B, C, N, O`.

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`N` has `+ve Delta_(eg)H^(ɵ)` because of its stable half-filled electronic configuration. Whereas in case of `B, C` and `O`, since the size decreases along the period `(rarr)` i.e., from `B` to `C` and to `O`, thus `Delta_(eg)H^(ɵ)` becomes more and more `-ve` from `B rarr C rarr O`.
Thus, the overall decreasing order of `Delta_(eg)H^(ɵ)` is `N gt B gt C gt O`.
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