Question

what do you mean by saying that energy of electron is Quantised ?​

Answer 1

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✍.. This means that the electrons in an atom have only definite values of energies.

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Answer 2

Answer:

Electrons exist on specific energy levels and cannot exist in between them. When an electron moves to another energy level, it must release or absorb very specific amounts of energy. This is what quantized means: the amount of energy absorbed or released can only be specific quantities called quanta.