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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.

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It will be more closer to 575 kJ/mol. The value for `Al(1s^(2)2s^(2)2p^(6)3s^(2)3p^(1))` should be lower than that of `Mg(1s^(2)2s^(2)2p^(6)3s^(2))`, because 3p-electrons in Al is effectively shielded by the electrons from the nucleus by 3s-electrons.
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