To find the atomic mass (atomic weight) of an atom you need to
a. how many protons are in the atom
b. how many neutrons are in the atom
c. the average number of protons and neutrons of all like substances on earth (example- silver)
d. the chemical symbol, using letters

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.)

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

In pqr m< p=60 m< q= 30 and m