Question

the amount of energy liberated in 2nd electron affinity is actually

Answer 1

Answer:

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Explanation:

Adding electrons, if they stablise the system (here, the atom), release energy as a part of lowering of its electrostatic potential energy. This creates a lower energy state for the atom (now an anion) i.e., the nucleus + electron cloud to exist.

Stability is imparted due to quantum mechanical reasons (Aufbau principle). We can also, speaking in strictly chemical terms, say that the stability is due to their noble gas electronic configuration.

Although, note that during hybridisation, a concept of VBT, the electrons move into a higher energy valance subshell, which is against the Aufbau rule of build up.