Silver and gold have rather low chemical affinities for oxygen, lower than copper, and it is therefore expected that silver oxides are thermally quite unstable. Soluble silver(I) salts precipitate dark-brown silver(I) oxide, Ag2O, upon the addition of alkali.
Silver and gold are less chemically reactive with oxygen compared to copper, making silver oxides likely to decompose at high temperatures.  Adding alkali to soluble silver(I) salts results in the formation of dark-brown silver(I) oxide (Ag2O).