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Protons are positively charged subatomic particles that are found in the nucleus of atoms. Together with neutrons, they form the nucleus of an atom, while electrons orbit around the nucleus. Protons have a mass of approximately 1 atomic mass unit and a charge of +1 elementary charge. This positive charge is balanced by an equal number of negatively charged electrons in a neutral atom. The number of protons in an atom determines its atomic number, which in turn dictates the element's properties. For example, an atom with one proton is hydrogen, while an atom with 92 protons is uranium. Protons also play a crucial role in chemical reactions and the stability of atomic structures. In addition to their significance in atomic structure, protons are also fundamental particles in particle physics. They are composed of quarks, specifically two up quarks and one down quark. Protons are stable particles and are essential building blocks of matter in the universe. In conclusion, protons are vital components of atoms and are fundamental particles in the realm of particle physics. Their properties and behaviors contribute to our understanding of the nature of matter and the universe as a whole.