In
chemistry,
Protium is the most common
isotope of the element
hydrogen that has one
proton and no
neutrons. It is denoted by the symbol ¹H.
Other isotopes of hydrogen are the rarer deuterium and the radioactive isotope tritium.
In
biology,
Protium is a
genus of chiefly tropical American trees having fragrant wood and yielding gum
elemi[?].