Which is a characteristic of the nucleus of an atom?

• A. It occupies most of the atom's volume.
• B. It has a negative charge.
• C. It is surrounded by electrons in fixed orbits.
• D. It contains protons and neutrons.

Answer: (D)

Verified step by step guidance

1. Recall the basic structure of an atom, which consists of a nucleus and electrons surrounding it.
2. Understand that the nucleus is the central part of the atom and contains protons and neutrons.
3. Recognize that protons have a positive charge, neutrons have no charge, and electrons have a negative charge.
4. Note that the nucleus occupies a very small volume compared to the entire atom, so it does not occupy most of the atom's volume.
5. Remember that electrons are found outside the nucleus, often described as being in regions or orbitals, but not fixed orbits.