What is the atomic mass of hydrogen?

So called because it is twice the mass of hydrogen. An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of 2.014. Also called heavy hydrogen, hydrogen-2. An isotope of hydrogen whose nucleus has one proton and one neutron and whose atomic mass is 2. read more

The atomic mass of hydrogen is 1.00794 amu (atomic mass units). Its atomic number is 1, and hydrogen has one electron and one proton. This element is a gas at room temperature. read more

Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. read more