URGENT

Classifying the following reaction:
silver carbonate -> silver oxide + carbon dioxide
(A) combination
(B) decomposition
(Csingle replacement
(D) double replacement
(E) combustion

answer; i believe that the correct answer is (a); a large rock being weathered by wind and rain;

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

i believe the answer is 5,000