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The first ionization enthalpy (Delta(t)H...

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

Text Solution

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It will more close to `575 kJ mol^(-1)` because the vlaue of Al should be lower than that of Mg. This due to effective shielding of 3p electrons from the nucleus by 3s-electrons.
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