**Correct Option: C. Proton** ### Detailed Explanation: 1. **Understanding Subatomic Particles**: - Atoms are the basic building blocks of matter and consist of three main types of subatomic particles: protons, neutrons, and electrons. - Protons and neutrons are located in the nucleus (the center) of the atom, while electrons orbit around the nucleus. 2. **Charge of Subatomic Particles**: - **Proton**: This particle carries a positive charge (+1). It is one of the two particles that make up the nucleus of an atom. - **Neutron**: Neutrons are neutral particles, meaning they have no charge (0). They also reside in the nucleus alongside protons. - **Electron**: Electrons carry a negative charge (-1) and are found in the electron cloud surrounding the nucleus. - **Photon**: A photon is a particle of light and does not have a charge. It is not a constituent of atoms but rather a quantum of electromagnetic radiation. 3. **Why Option C is Correct**: - The question specifically asks for a subatomic particle that has a positive charge and is found in the nucleus. The proton fits both criteria perfectly: - It has a positive charge. - It is located in the nucleus of the atom. ### Analysis of Other Options: - **Option A: Electron**: - Electrons are negatively charged and are not found in the nucleus; they orbit around it. Therefore, this option is incorrect. - **Option B: Neutron**: - Neutrons are neutral particles (no charge) and, while they are found in the nucleus, they do not meet the requirement of having a positive charge. Thus, this option is also incorrect. - **Option D: Photon**: - Photons are massless particles that carry electromagnetic radiation (light) and have no charge. They are not found in the nucleus and do not fit the criteria of the question. Therefore, this option is incorrect as well. ### Summary of Key Points: - **Protons** are positively charged particles located in the nucleus of an atom. - **Neutrons** are neutral and also found in the nucleus, but they do not have a charge. - **Electrons** are negatively charged and orbit the nucleus, not residing within it. - **Photons** are not subatomic particles of atoms and carry no charge. ### Revision Summary: - Protons are positively charged and found in the nucleus. - Neutrons are neutral and also in the nucleus, but do not have a charge. - Electrons are negatively charged and orbit the nucleus. - Photons are particles of light with no charge and are not part of the atomic structure.