Question

Arrange the bonds in order of increasing ionic character in the molecules: LiF, K2O, N2, SO2 and ClF3.

The first ionization enthalpy (∆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 ∆i H value for Al will be more close to 575 or 760 kJ mol–1 ? Justify your answer.

What is the significance of the terms — 'isolated gaseous atom' and 'ground state' while defining the ionization enthalpy and electron gain enthalpy?

Energy of an electron in the ground state of the hydrogen atom is –2.18×10–18J. Calculate the ionization enthalpy of atomic hydrogen in terms of J mol–1.