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Protons are a fundamental building block of matter, along with neutrons and electrons. They are located in the atomic nucleus at the center of an atom. Protons have a positive electric charge, which helps to hold the nucleus together through electromagnetic forces. The number of protons in an atom determines the element's identity on the periodic table. The mass of a proton is approximately equal to the mass of a neutron, and both particles are much heavier than electrons. Protons are stable particles and are not subject to radioactive decay. In particle physics, protons can participate in strong interactions with other particles, such as in proton-proton collisions in particle accelerators. In conclusion, protons are essential components of atoms and are crucial for understanding the behavior of matter on a microscopic level. Their positive charge gives atoms their overall positive charge, which determines how they interact with other atoms to form molecules.