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  4. What is the order of successive ionisation enthalpies?

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Q. What is the order of successive ionisation enthalpies?

Classification of Elements and Periodicity in Properties

Solution:

The ionization energy of a multivalent atom increases with a consecutive removal of an electron. This is due to an increase in effective nuclear charge on the valence electron that makes it difficult to ionize a cation.
Therefore $IE _{1} < IE _{2} < IE _{3}$