The first ionization enthalpy `(Δ_i H )` values of the third period elements, `Na, Mg` and `Si` are respectively `496,

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Q 3005345268.     The first ionization enthalpy `(Δ_i H )` values of the third period elements, `Na, Mg` and `Si` are respectively `496, 737` and `786 kJ mol^(–1).` Predict whether the first `Δ_i H` value for `Al` will be more close to `575` or `760 kJ mol^(–1)` ? Justify your answer.

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