H+

Forms of hydrogen:1(Molecular hydrogen H₂ two hydrogen atoms (H) covalently bonded together as H-H) 2(ATOMIC-single hydrogen atom (H^•) is neutral and has an unpaired electron (as represented by the small dot “•”) 3(Anion, it has one proton and two electrons, which makes it a negative ion written as H^–.) 4(A positively charged hydrogen ion (H⁺ cation) is also known as just a proton.)