A triatomic allotrope of this element is depleted by stratospheric CFCs.
A quantity named "delta-18" this measures the ratio of two isotopes of it. Due to the development of bubble overpotential, this substance, rather than chlorine, evolves at the anode in the electrolysis of a salt solution. Its molecular variety usually exists in a triplet state which is paramagnetic. It may be converted into an unusual two-atom reactive species with oxidation number minus one-half described by the term "super". A triatomic allotrope of this element is depleted by stratospheric CFCs. For 10 points, name this strongly electron-accepting element whose diatomic form is the second most common gas in the atmosphere, and whose atomic number is 8.
A quantity named "delta-18" this measures the ratio of two isotopes of it.
oxygen [or dioxygen; or trioxygen; or O; or O2; or O3; accept superoxide; prompt on “ozone”] &lt;DStobierski/AS&gt;