Hydrogen is the lightest elements of all that are on the periodic table. Hydrogen makes up 90 percent of our universe. Most of that is because it is so flammable that it burns brightly in the stars, comets, meteors, and of flaming space stuff. Its atomic number is one so it only has one electron and one proton but no neutron. The atomic mass is 1.00794. the CAS registry ID is 1333-74-0 (I have no Idea what that means but it was on the website and looked good enough.) Hydrogen is odor-less, taste-less, and invisible gas. It was discovered first by a sixteenth century alchemist, Paraculus. It was first recorded in the seventeen hundreds by Nicolas Lemery.
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