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The first ionization enthalpy (Deltai H ...

The first ionization enthalpy `(Deltai H )` values of the third period elements, Na, Mg and Si are respectively 496, 737 and `786 kJ "mol"^(-1)`. Predict whether the first `Deltai H` 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 AI `(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 AI is effectively shielded by the electrons from the nucleus by 3s - electrons .
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