Many inorganic molecular intermediates, such as imide, nitrate, and sulfite, incorporate a stoichiometric number of added metal atoms into their structures on Ag(110) or Cu(110). In this paper an example of such general behavior is illustrated with an organic molecular intermediate––acetylide (C 2 ) on Ag(110). Acetylide is produced by reacting acetylene with oxygen atoms on the Ag(110)-p(2×1)-O surface. Acetylides form row structures along the 〈11¯0〉 axis, which, as coverage increases, are compressed along the 〈001〉 axis to form nominal “p(2×2)”, “p(2×3)”, “p(2×1)”, and “p(14×1)” structures. The final acetylide structure incorporates 0.55 ML silver atoms, which may be released upon titration with acetic acid. A buckled structure is proposed where acetylide bonds to two added silver atoms in a linear configuration in the trough along the 〈11¯0〉 axis with seven equally spaced silver atoms in a p(13×1) unit cell.