Assertion: hydrogen atom | /r/HasAspect | a nucleus of only one proton
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Source sentences:
text: And since hydrogen atoms have a nucleus of only one proton, the spectrum energy of an hydrogen atom depends only by the nucleus (e.g. in the Coulomb field): in fact, the mass of one proton is ca 10 4 5 {\displaystyle {\frac {10^{4}}{5}}} times the mass of an electron, which gives only the zero order of approximation and thus may be not taken into account.[clarification needed]