Hydrogen ion

One understands by a hydrogen ion

• the positively charged hydrogen ion H ⁺ in the sense of chemistry, see proton (chemistry)
• the positively charged hydrogen ion H ⁺ in the sense of physics, see proton
• the negatively charged hydride ion H ^- in the class of the hydrides
• the negatively charged hydrogen ion H ^- , i.e. a hydrogen atom with two electrons
• the positively charged hydrogen molecular ion H ₂ ⁺ , see dihydrogen cation

This is a disambiguation page for differentiating between several terms identified with the same word.