Hydrogen
The lightest element with only one proton is hydrogen.
Hydrogen is not only the lightest but the only known element with only 1 proton per atom.
Hydrogen is the lightest element.
The lightest element of all should have the lightest atomic mass. It is hydrogen-1 isotope. This atom has only one proton and no neutrons.
Element 1 is hydrogen. It is the lightest and most abundant element in the universe, with one proton and one electron in its atomic structure.
Hydrogen.
Hydrogen. It is the lightest element in the known universe.
Hydrogen is the lightest element. The isotope protium is the lightest kind of hydrogen atom.
That would be hydrogen!!
Hydrogen has only one proton (atomic number 1). It has its nucleus and its single proton.
The lightest element on the periodic table with no stable isotopes is hydrogen. It only has one proton in its nucleus and no stable isotopes.
The only element that has one proton and no neutrons is a hydrogen atom.