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

Ionisation enthalpy (Delta_(t)H_(l) "in" kJ mol^(-1)) for the elements of group-13 follows the order

Ionisation enthalpy (Delta_(t)H_(l) "in" kJ mol^(-1)) for the elements of group-13 follows the order

The first ionisation enthalphies (Delta_(i)H_(1)) of the elements of group - 16 are unexpectedly lower while their those of the corresponding elements of group-15 explain.

The first (Delta_(i)H_(1)) and second (Delta_(i)H_(2)) ionization enthalpies ("in kJ mol"^(-1)) and the electron gain enthalpy (Delta_(eg)H)("in kJ mol"^(-1)) of the elements I, II, III, IV and V are given below the least reactive non - metal and the most reactive metal of these are respectively

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 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.