WBromine
WBromine monochloride
WChlorine
WChlorine dioxide
WDiazomethane
WDichloramine
WDichlorine monoxide
WFluorine
WFluorine azide
WHexafluorothioacetone
WIodine
WNitrogen dioxide
WNitrosyl cyanide
WOzone
WPlatinum hexafluoride
WTrifluoronitrosomethane
WXenon hexafluoride