Question

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why Ionisation energy 1 is less than ionisation energy 2??​

Answer 1

Answer:

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Because the size of the last orbital is large and less energy required to removed electron so first energy potential is lower than 2nd. The second electron removed takes more energy than the first because the nucleus carries a higher positive charge than its electrons.

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Answer 2

Ionisation energy 1 is less than ionisation energy 2 because it's easy to remove electron from a neutral atom since no of e- and no of p+ are same but as soon as u have removed an e- then it forms an ion that has overall positive charge since it has lost an electron that Alos means that nuclear charge over Valence increases too that's why it's harder to remove e- the second time and that's why the ionisation energy 2 is higher than ionisation energy 1 or ionisation energy 1 is less than ionisation energy 2.