tetraoxygen
oxozone

Even the chemical formula of O, tetraoxygen, is predictable as a group 16 element.

Nevertheless, tetraoxygen has been detected as a short-lived chemical species in mass spectrometry experiments.

There is also an allotrope called tetraoxygen, or O, and six allotropes of solid oxygen including "red oxygen", which has the formula O.

The tetraoxygen molecule (O) was first predicted in 1924 by Gilbert N. Lewis, who proposed it to explain why liquid oxygen defied Curie's law.

The tetraoxygen molecule (O), also called oxozone, was first predicted in 1924 by Gilbert N. Lewis, who proposed it as an explanation for the failure of liquid oxygen to obey Curie's law.