O2 (singlet, 2nd excited state) Oxygen, 2nd excited singlet state Singlet oxygen, 2nd excited state O 2      Real, short lived (transient), electronically neutral species. Gram formula weight (molecular mass) = 31.998 Wikipedia Page: Oxygen, 2nd excited singlet state is defined with respect to the entities below: The entities below are defined with respect to: Oxygen, 2nd excited singlet state Binary material (generic) Oxygen Per-oxygen oxidising agent (generic) chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis