An atom in an excited state a. has more energy than it does in the ground state b. has one more electron than it does in the ground state c. is more stable than it is in the ground state d. has less energy than it does in the ground state

Iam in desperate need of with this !

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

State one important difference between a physical change and a chemical change?