CGPET 2017 Solved Paper

The ionisation enthalpy depend on the following factors:
(i) Half-filled or fully filled atomic orbitals are more stable than other incomplete orbitals.
(ii) Smaller the size of atom/ion, more is the ionisation energy. (I.E.). For 2nd I.E. all elements have M+ configurationHence, correct order for 2 nd I.E. is
Li+>B+>C+>Be+
or Li>B>C>Be