Dictionary entry overview: What does isle mean? â¢ ISLE (noun) The noun ISLE has 1 sense: 1. a small island Familiarity information: ISLE used as a noun is very rare.
The sulfate ion is SO42- The sulfite ion is SO32- and is more basic that sulfate.
SO3 may refer to. 1  Sulfur trioxide, a chemical compound of sulfur and oxygen. 2  Sulfite, a chemical ion composed of sulfur and oxygen with a 2â charge. Sulfite, a chemical ion composed of sulfur and oxygen with a 2â charge. 2  SO(3) , the special orthogonal group in 3 dimensions; the rotations that can be given an object in 3-space. 3  Star Ocean: Till the End of Time, the third main game in the Star Ocean series. 4  A staff officer of the third class, usually a junior officer.