Question

In chemistry: what is exchange energy? how it influence the stability​

Answer 1

This can be directly appreciated by considering the simplest case of two hydrogen atoms, first held at large distance and then brought closer together for the electronic wavefunctions centred on the two atoms to overlap. The consequent splitting of the energies of the two-particle singlet and triplet states is due to exchange (reason why it is called 'exchange splitting'). Through this, the singlet state stabilises as the unique ground state of the diatomic system

Answer 2

Explanation:

Electrons of similar spin develop an exchange interaction which leads to stabilizes the system. Thus the electrons of similar spin repulsion less by an amount called exchange energy. Therefore greater the number of electrons with parallel spins the greater is the exchange energy and greater is the stability. This theory is the basis of the Hunds rule of maximum spin multiplicity...

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