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The hydrogen atom contains an electron with a mass of me=0.91·10-30 kg and an electrical charge of qe=-1.6·10-19 C, and a proton with a mass of mp=-1.7·10-27 kg and an electrical charge of qp=+1.6·10-19 C. The hydrogen atom belongs to the systems that can be resolved exactly in quantum mechanics. The hydrogen atom has a special signifance in quantum mechanics because exact solutions for the hydrogen atom form the basis of approximations for systems with several electrons (multi-electron systems, molecules). Initially, theoretical explanations of atomic spectra, especially those of hydrogen atoms, were the incentives for the development of quantum mechanics and later proved to be among the significant first successes.