In a Carbon-12 atom, what is the energy of the rst energy level in the atomic nucleus above the ground state? Rank the following isotopes of uranium and plutonium according to their half-lives,...

In a Carbon-12 atom, what is the energy of the rst energy level in the atomic nucleus above the ground state?

Rank the following isotopes of uranium and plutonium according to their half-lives, starting with the shortest halflife and proceeding to the longest: U-234, U-235, U-238, Pu-239, Pu-241