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Bioenvironmental Engineering (BEE) Block 7 Practice Test

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What subatomic particles are found orbiting the nucleus in the electron cloud on paths known as shells?
Correct Answer:
Electrons
Explanation:
Electrons are the subatomic particles that orbit the nucleus in the electron cloud. The nucleus stays at the center with protons and neutrons, while electrons occupy surrounding energy levels called shells (or orbitals) and are held in by the electrostatic attraction to the positively charged nucleus. Quarks are the smaller constituents inside protons and neutrons, not free-floating in orbit, and neutrons themselves reside in the nucleus rather than orbiting. So the particles found orbiting the nucleus are electrons.

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