The shells around the nucleus are called energy levels. Why?

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Solution

Electrons are subatomic particles that move around a nucleus in fixed orbitals called energy levels.
These levels or orbits are represented with definite letters, K, L, M, N, and so on.
Electronic levels:
A particular amount of energy is related to each electron revolving in a shell.
The energy changes when it transfers to another shell and when it goes from one energy level to another.
Shells are also known as energy levels as they show an electron's energy as well as its location.
Near the nucleus, electrons have much less energy than all those that are further away.
To explain the behavior of electrons, the idea of an electronic shell is used.

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