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hydrogen ion

A Dictionary of Astronomy | 1997 | 492 words | Copyright

hydrogen ion A hydrogen atom that has gained or lost an electron, and thus has an electric charge. The positive hydrogen ion, H+, has lost its only electron and therefore consists of a single proton. A nebula containing H+ ions is known as an H II region. The negative hydrogen ion, H−, has gained a second electron. H− ions are found in the outer layers of stars such as the Sun. Most of the light received from the Sun actually originates from the formation of H− ions.

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