<Tr> <Td> Excess energy </Td> <Td> 7288.969 ± 0.001 keV </Td> </Tr> <Tr> <Td> Binding energy </Td> <Td> 0.000 ± 0.0000 keV </Td> </Tr> <P> A hydrogen atom is an atom of the chemical element hydrogen . The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force . Atomic hydrogen constitutes about 75% of the baryonic mass of the universe . </P> <P> In everyday life on Earth, isolated hydrogen atoms (called "atomic hydrogen") are extremely rare . Instead, hydrogen tends to combine with other atoms in compounds, or with itself to form ordinary (diatomic) hydrogen gas, H. "Atomic hydrogen" and "hydrogen atom" in ordinary English use have overlapping, yet distinct, meanings . For example, a water molecule contains two hydrogen atoms, but does not contain atomic hydrogen (which would refer to isolated hydrogen atoms). </P>

What is the common makeup of a hydrogen atom