Carbon has four valence electrons, and oxygen has six valence electrons. if carbon and oxygen bond covalently, which of the following is the correct lewis dot (electron dot) structure for carbon dioxide?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)