What surrounds the nucleus at fixed distances?

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Multiple Choice

What surrounds the nucleus at fixed distances?

Explanation:
Electrons occupy shells around the nucleus at fixed distances. These shells are energy levels that define where electrons are most likely to be found at specific radii from the nucleus. The nucleus itself contains protons and neutrons, while protons stay inside the nucleus. Quarks are the smaller particles inside protons and neutrons, not something that surrounds the nucleus. Neutrinos are very light, weakly interacting particles not arranged around the nucleus. So the regions at fixed distances around the nucleus are the electron shells.

Electrons occupy shells around the nucleus at fixed distances. These shells are energy levels that define where electrons are most likely to be found at specific radii from the nucleus. The nucleus itself contains protons and neutrons, while protons stay inside the nucleus. Quarks are the smaller particles inside protons and neutrons, not something that surrounds the nucleus. Neutrinos are very light, weakly interacting particles not arranged around the nucleus. So the regions at fixed distances around the nucleus are the electron shells.

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