Two-atom molecules found in stars Molecule Designation AlH[7] Aluminium monohydride AlO[7] Aluminium monoxide C2[7] Diatomic carbon CH[8] Carbyne CN[8][9] Cyanide CO[10] Carbon monoxide CaCl[7] Calcium chloride CaH[11] Calcium monohydride CeH[12] Cerium monohydride CeO[9] Cerium monoxide CoH[7] Cobalt hydride CrH[7] Chromium hydride CuH[7] Copper hydride FeH[12] Iron hydride HCl[7] Hydrogen chloride HF[7] Hydrogen fluoride H2[4] Molecular hydrogen LaO[7][9] Lanthanum oxide MgH[13] Magnesium monohydride MgO[9] Magnesium oxide NH[8] Imidogen NiH[7] Nickel hydride OH[7] Hydroxide ScO[7] Scandium oxide SiH[7] Silicon monohydride SiO[7] Silicon monoxide TiO[14][15] Titanium oxide VO[7] Vanadium oxide YO[7][9] Yttrium oxide ZnH[7] Zinc hydride ZrO[7][9] Zirconium oxide