Chemistry
Give reasons for the following.
The shells surrounding the nucleus of an atom are also called 'energy levels'.
Answer
Each shell is associated with a certain amount of energy. As long as the electron rotates in one of the energy levels, it neither loses nor absorbs energy. On gaining energy electron moves to a higher energy shell and on losing energy it drops back to the original energy shell radiating the extra energy. Hence, the shells surrounding the nucleus of an atom are also called 'energy levels'.
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