Valence electrons

a. have the highest energy level number
b. are gained or lost to form ions
c. all of the above
d. none of the above

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.)

Calculate the number of molecules present in 0.750 mol of mgo.

What are transitions between a liquid and gas called? identify which way they are transitioning