The second ionisation energy of N and O in electron volt are respectively given by:

The first ionisation energies of magnesium and aluminium are respectively given by

The first ionisation energies of magnesium and aluminium are respectively given by

Ionisation energy and electron affinity of noble gases respectively are

The value in electron-volt per atom which represent the first ionisation energy of oxygen and nitrogen atom respectively are

The value in electron-volt per atom which represent the first ionisation energy of oxygen and nitrogen atom respectively are

The correct order of ionisation energy of C,N,O and F is

The first ionisation enthalpies (in eV) of N & O are respectively given by: