In a decomposition reaction:.
A) one of the reactants is often water
B) the reactants are generally two ionic compounds in aqueous solution
C) energy in the form of heat or light is often produced
D) the reactants are usually a metal and a nonmetal

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

c (diamond),

sio2 (quartz)