The ionisation potentials of Li and K are 5.4 and 4.3 eV respectively. The ionization potential of Na will be:

The first ionization potential of Li will be

The First ionisation potential of Na ,Mg and Si are 496 , 737 and 786 "kj mol"^(-1) respectively . The ionisation potential of Al will be closer to

The first ionisation potentials (eV) of Be and B respectively are

The first ionisation potentials (eV) of Be and B respectively are