A trioxide is a compound with three oxygen atoms. For metals with the M 2 O 3 formula there are several common structures. Al 2 O 3, Cr 2 O 3, Fe 2 O 3, and V 2 O 3 adopt the corundum structure. Many rare earth oxides adopt the "A-type rare earth structure" which is hexagonal.

Sulfur trioxide (alternative spelling sulphur trioxide) is the chemical compound with the formula SO 3. It has been described as "unquestionably the most [economically] important sulfur oxide". [1] It is prepared on an industrial scale as a precursor to sulfuric acid.

Trioxidane (systematically named dihydrogen trioxide, [2] [3]), also called hydrogen trioxide [4] [5] is an inorganic compound with the chemical formula H[O] 3 H (can be written as [H(μ-O 3)H] or [H 2 O 3]). It is one of the unstable hydrogen polyoxides. [4] In aqueous solutions, trioxidane decomposes to form water and singlet oxygen:

Sulfur trioxide is generally a colorless liquid but can also exist as ice- or fiber-like crystals or as a gas. When sulfur trioxide is exposed to air, it rapidly takes up water and gives off white fumes. It combines with water, releasing considerable heat while forming sulfuric acid.

Sulfur trioxide | SO3 or O3S | CID 24682 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

The meaning of TRIOXIDE is an oxide containing three atoms of oxygen.

The dioxide is the acid anhydride (a compound that combines with water to form an acid) of sulfurous acid; the trioxide is the acid anhydride of sulfuric… …with oxygen to form the trioxide, which is then combined with water.

Sulphur trioxide is a white crystalline solid which fumes in air with the chemical formula SO3. Visit BYJU'S to understand the properties, structure and its uses.

Sulfur trioxide is defined as an essential reagent in the sulfonation reactions. These processes afford dyes, pharmaceuticals, and detergents. Sulfur trioxide can be generated in situ from the sulfuric acid, or it can be used as a solution in the acid.

Summary: Sulfur trioxide (SO3) is generally a colorless liquid. It can also exist as ice- or fiber-like crystals or as a gas. When SO3 is exposed to air, it rapidly takes up water and gives off white fumes. It can react with water to form sulfuric acid.