Which of the following best describes the structure of an atom?

• A. Protons, neutrons, and electrons all located in the nucleus
• B. A dense nucleus containing protons and neutrons, surrounded by electrons in a cloud
• C. Electrons and protons evenly distributed throughout the atom
• D. A nucleus made only of electrons, with protons and neutrons orbiting around it

Answer: (B)

Verified step by step guidance

1. Recall the basic structure of an atom: it consists of a nucleus and electrons surrounding it.
2. Understand that the nucleus contains protons and neutrons, which are densely packed together.
3. Recognize that electrons are not located in the nucleus but instead exist in a cloud-like region around the nucleus.
4. Note that protons have a positive charge, neutrons are neutral, and electrons have a negative charge, which influences their arrangement.
5. Conclude that the best description is a dense nucleus containing protons and neutrons, surrounded by electrons in a cloud.