Which subatomic particle carries a positive charge and is located in the nucleus?

• A. Proton
• B. Electron
• C. Neutron
• D. Photon

Answer: (A)

Protons are positively charged particles that reside in the atomic nucleus. This combination—positive charge plus location in the nucleus—matches what the question is asking. Electrons have negative charge and orbit outside the nucleus in electron clouds, not inside. Neutrons sit in the nucleus too but have no charge, so they don’t fit the “positive charge” part. Photons are particles of light and aren’t located in the nucleus at all, nor do they carry a static electric charge like protons do.