Which of the following best describes an electron?

• A. It has a negative charge and a mass greater than a proton.
• B. It has no charge and is found in the nucleus.
• C. It has a positive charge and a mass equal to a neutron.
• D. It has a negative charge and a very small mass compared to a proton.

Answer: (D)

Verified step by step guidance

1. Recall the basic properties of subatomic particles: protons, neutrons, and electrons.
2. Understand that electrons carry a negative charge, protons carry a positive charge, and neutrons have no charge.
3. Compare the masses: electrons have a much smaller mass compared to protons and neutrons.
4. Note the location of electrons: they are found outside the nucleus, while protons and neutrons are inside the nucleus.
5. Based on these facts, identify that the electron is best described as having a negative charge and a very small mass compared to a proton.