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Ionisation enthalpy (Delta(i)"H kJ mol"^...

Ionisation enthalpy `(Delta_(i)"H kJ mol"^(-1))` for the elements of group 13 follows the order.

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`B gt Al lt Ga gt In lt Tl`
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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.

The first (DeltaH_(1)) and second (DeltaH_(2)) ionisation enthalpies (in kJ mol^(-1)) and the (DeltaH_(eg)) electron gain enthalpy (in kJ mol^(-1)) of a elements are given below: Based on the above information match the following columns.

The first ionization enthalpy (Delta_(i)H) values of the second period elements Li, Be and C are respectively 520, 899 and 1086 kJ mol^(-1) . Predict whther the first Delta_(i)H value for B will be more close to 690 or 990 kJ mol^(-1) ?

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 value for Al will be more close to 575 or 760 kJ mol^(-1) ? Justify your answer.

The second ionisation enthalpy of the elements of group 1 are higher than those of elements of group 2 . Explain.