Definition

1. Adjective:
   • Of or containing copper with a valence of one: "Cuprous" describes compounds or ions in which copper exhibits a +1 oxidation state. It is the less common oxidation state compared to cupric (+2).

Usage

• The term "cuprous" is primarily used in scientific contexts, especially in chemistry and materials science, to specify the monovalent state of copper.
• It is often contrasted with "cupric," which refers to divalent copper (Cu²⁺).

Examples

• Adjective:
  • Cuprous oxide (Cu₂O) is a red powder used as a pigment and fungicide.
  • The experiment aimed to reduce the cupric ions to the cuprous state.

Advanced Usage

• "Cuprous ion": Refers specifically to the copper(I) ion, Cu⁺.
  • The stability of the cuprous ion in aqueous solution is limited.
• In compound names: Used systematically in chemical nomenclature (e.g., cuprous chloride for copper(I) chloride, CuCl).

Variants and Related Words

• Cupric (adj): Of or containing divalent copper (copper with a +2 oxidation state).
  • Cupric sulfate is a common laboratory reagent.
• Copper(I) (adj): Modern IUPAC nomenclature equivalent to "cuprous."
  • Copper(I) oxide is synonymous with cuprous oxide.

Synonyms

• Copper(I): The systematic chemical term for the +1 oxidation state of copper.

Notes

• The term "cuprous" is derived from "cuprum," the Latin word for copper, with the suffix "-ous" indicating the lower of two common oxidation states (cf. ferrous/ferric for iron).
• In modern chemical practice, the Stock nomenclature (e.g., copper(I)) is preferred, but "cuprous" remains in common use, particularly in industrial and older technical contexts.

Adjective

1. of or containing divalent copper