Most atoms of uranium, which has 92 protons, are either uranium-235 or uranium-238. Compare the mass numbers and atomic numbers of these two isotopes of uranium. Recall, atomic number is the number of protons in the nuclei of elements.

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.