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The ionisation potentials of atoms A and...

The ionisation potentials of atoms `A` and `B` are `400` and `300 kcal mol^(-1)` respectively. The electron gain enthalpy of these atoms are `80.0` and `85.0 kcal mol^(-1)` respectively. Which of the atoms has highrt electronegativity.

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Substituting the value of `IP, EA` (or `Delta_(eg)H^(ɵ)`) in EQ. (ii) of Mulliken's scale, we get
`chi_(A) = (400+80)/(2 xx 62.5) = 3.84`
`chi_(B) = (300 + 85)/(2 xx 62.5) = 3.08`
Hence atom `A` has higher `EN`.
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