Answer:
the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
Explanation:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the steps of a staircase.
John Muir lived up to his doctrine by not being the first man to reach the camp. He was no simple hiker. He would stop many times during his way up to examine trees, flowers, animals, nature, and everything that surrounded him. This means he didn't rush through life, he enjoyed every part of it.
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