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Protons are one of the building blocks of all matter in the universe. They are found in the nucleus of atoms, alongside neutrons. Protons carry a positive charge, which is equal in magnitude to the negative charge of electrons, the other main subatomic particle found in atoms. The number of protons in an atom determines its atomic number, which in turn determines the element it represents. For example, an atom with one proton is hydrogen, while an atom with 92 protons is uranium. Protons play a vital role in the stability of atoms. They are held together in the nucleus by the strong nuclear force, which overcomes the repulsive forces between positively charged protons. Without protons, atoms would not exist as we know them. Furthermore, protons are also used in various scientific and medical applications, such as proton therapy for cancer treatment. The incredible power of protons continues to be a fascinating area of study for scientists around the world.