Protium

Noun

1. Template:ChemistryA type of Hydrogen atoms that they nuclear has only one proton. It can write as ${\phantom{A}}_{\phantom{1}}^{\phantom{1}}{\phantom{A}}_{\phantom{2}1}^{\phantom{2}1}\mathrm{H}$ or ${\phantom{A}}_{\phantom{}}^{\phantom{1}}{\phantom{A}}_{\phantom{2}}^{\phantom{2}1}\mathrm{H}$ or $\mathrm{H}$, but not write as P.
2. Template:ChemistrySubstance consisted by protium atoms.