Which term describes the group of protons and neutrons located at the center of all atoms?

• A. Orbital
• B. Nucleus
• C. Shell
• D. Electron cloud

Answer: (B)

Verified step by step guidance

1. Understand the structure of an atom, which consists of protons, neutrons, and electrons arranged in specific regions.
2. Recall that protons and neutrons are located together in the central part of the atom, while electrons are found in regions around the nucleus.
3. Identify the term used to describe the central part of the atom where protons and neutrons reside.
4. Recognize that 'Nucleus' is the correct term for the group of protons and neutrons at the center of the atom.
5. Differentiate this from other terms: 'Orbital' and 'Shell' refer to regions where electrons are likely found, and 'Electron cloud' describes the overall area where electrons move.