Molecular hydrogen occurs in two nuclear isomeric forms, orthohydrogen with the nuclear spins of its two protons aligned parallel to each other, and parahydrogen with its two proton spins aligned antiparallel. These two forms can be called spin isomers or more specifically nuclear spin isomers.
Molecular hydrogen occurs in two nuclear isomeric forms, orthohydrogen with the nuclear spins of its two protons aligned parallel to each other, and parahydrogen with its two proton spins aligned antiparallel. These two forms can be called spin isomers or more specifically nuclear spin isomers.
Source: Wikipedia "Spin isomers of hydrogen" · CC BY-SA 4.0
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