Hydrogen (abbreviated "H") is the lightest of all elements. It usually consists only of a positively charged proton and a negatively charged electron and is also called protium in this form. But there ...

Deuterium is a stable isotope of hydrogen, which, unlike “normal” hydrogen atoms, or protium, also contains a neutron. The isotope deuterium has one proton, one neutron and one electron. One out of ...