Which statement about subatomic particles is true?

• A. Protons are found outside the nucleus.
• B. Protons and neutrons have approximately the same mass.
• C. Electrons have a greater mass than protons.
• D. Neutrons carry a positive charge.

Answer: (B)

Verified step by step guidance

1. Recall the three main subatomic particles: protons, neutrons, and electrons, and their basic properties.
2. Understand the location of each particle: protons and neutrons are located inside the nucleus, while electrons are found outside the nucleus in electron clouds or orbitals.
3. Compare the masses of protons, neutrons, and electrons: protons and neutrons have masses close to 1 atomic mass unit (amu), while electrons have a much smaller mass (about 1/1836 of a proton).
4. Review the charges of each particle: protons carry a positive charge (+1), neutrons are neutral (no charge), and electrons carry a negative charge (-1).
5. Based on these facts, identify the true statement: 'Protons and neutrons have approximately the same mass.'