State where the chemical potential energy released from a reaction is stored

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

What is the oxidation state of each individual carbon atom in c2o42−?