Chemical substance

Chemical element

Oxygen ( $O$ )

Nitrogen ( $N$ )

Carbon ( $C$ )

Helium ( $He$ )

Hydrogen ( $H$ )

Negative hydrogen ion ( $H^{-}$ )

A negative hydrogen ion is a hydrogen nucleus with two bound electrons. Its weakly bound extra electron permits absorption at visible and infrared wavelengths in cool stellar atmospheres.

Molecular nitrogen ( $N_{2}$ )

Molecular hydrogen ( $H_{2}$ )

Chemical compound

Vanadium(II) oxide ( $VO$ )

Titanium monoxide ( $TiO$ )

Acetylene ( $C_{2} H_{2}$ )

Hydrogen cyanide ( $HCN$ )

Carbon dioxide ( $CO_{2}$ )

Carbon monoxide ( $CO$ )

Ammonia ( $NH_{3}$ )

Methane ( $CH_{4}$ )

Water ( $H_{2} O$ )

 Ancestors (2)

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Chemical substance by

Ciro Santilli  40 Updated 2025-07-16

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