Cu2O. Cuprous is Cu+, cupric is Cu2+. Those are old-school names. Copper(I) oxide is a better name.
For example sodium oxalate has the chemical formula Na2C2O4.
The chemical formula for Calcium Oxalate is CaC2O4
Formula of ammonium oxalate monohydrate: (NH4)2C2O4.H2O
The formula of iron(III) oxalate is C6Fe2O12.
The chemical formula for molybdenum oxalate is Mo(C2O4)2.
The chemical formula for cuprous arsenide is Cu3As.
The chemical formula for cuprous fluoride is CuF.
For example sodium oxalate has the chemical formula Na2C2O4.
The chemical formula for cuprous phosphate is Cu3(PO4)2.
The chemical formula of zinc oxalate is C2O4Zn.
The chemical formula for Calcium Oxalate is CaC2O4
Formula of ammonium oxalate monohydrate: (NH4)2C2O4.H2O
The formula of iron(III) oxalate is C6Fe2O12.
Actually, the answer Cu(NO3)2 is incorrect for cuprous nitrate. Cu(NO3)2 is in fact cupric nitrate. Cuprous nitrate is represented as CuNO3 alone.
Ammonium oxalate monohydrate is (NH4)2C2O4•H2O
The chemical formula for molybdenum oxalate is Mo(C2O4)2.
Formula: FeC2O4