In an atom, where are electrons primarily located?

• A. In energy levels or orbitals surrounding the nucleus
• B. Attached to the surface of the nucleus
• C. Inside the nucleus with protons and neutrons
• D. In the atomic core

Answer: (A)

Verified step by step guidance

1. Understand the structure of an atom: it consists of a nucleus containing protons and neutrons, and electrons that are arranged around the nucleus.
2. Recall that electrons are negatively charged particles that do not reside inside the nucleus but occupy specific regions around it.
3. Learn that these regions where electrons are most likely to be found are called energy levels or orbitals, which are defined by quantum mechanics.
4. Recognize that energy levels are like shells around the nucleus, and orbitals are subregions within these shells where electrons have a high probability of being located.
5. Conclude that electrons are primarily located in energy levels or orbitals surrounding the nucleus, not attached to the nucleus surface, inside the nucleus, or in the atomic core.