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Protons are one of the fundamental particles that make up the atomic structure of all matter. They are found in the nucleus of an atom along with neutrons, while electrons orbit around the nucleus. Protons carry a positive charge, which is equal in magnitude to the negative charge of electrons, thus creating a neutral atom. The number of protons in an atom determines its atomic number, which in turn determines the element it represents. For example, an atom with 1 proton is hydrogen, while an atom with 6 protons is carbon. The mass of a proton is approximately 1.67 x 10^-27 kilograms. In addition to their role in atomic structure, protons are also involved in nuclear reactions and the stability of atoms. In particle accelerators, protons are accelerated to nearly the speed of light to collide with other particles, leading to the production of new particles or energy. Overall, protons are essential building blocks of the universe, playing a critical role in the composition and behavior of matter.