Iron has four stable isotopes, Fe - 54 5.85%, Fe - 56 91.75%, Fe - 57 2.12% and Fe - 58 0.28%. The average atomic mass of a sample of Iron will be closed to which
whole number?
A-56
B-58
C-54
D-57

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.