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The first ionisation enthalpy (Delta(i)H...

The first ionisation enthalpy `(Delta_(i)H^(o-))` values of the third period elements, `Na, Mg` and `Si` are respectively `496, 737` and `786 kJ mol^(-1)`. Predict whether the first `Delta_(i)H^(o-)` value for `Al` will be more close to `575` or `760 kJ mol^(-1)`? Justify your answer.

Text Solution

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It will be more close to `575 kJ mol^(-)`. The value for `Al` should be lower than that of `Mg` because of the effective shielding of `3p` electrons from the nucleus by `3s`-electrons.
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