(inorganic chemistry) any oxide containing five oxygen atoms in each molecule

plural of pentoxide

(inorganic chemistry) An orange crystalline powder, V₂O₅, used as a catalyst in the production of sulphuric acid etc.

(inorganic chemistry) the compound, P₂O₅, formed by the spontaneous combustion of white phosphorus in air; it reacts violently with water to form phosphoric acid and is used as a powerful desiccating agent

(inorganic chemistry) dinitrogen pentoxide

(inorganic chemistry) The unstable binary compound N₂O₅; a strong oxidizing agent.

plural of vanadium pentoxide