Please help How does this equation show that transmutation has taken place?
238 U
304 Th + He
A. One element changes into another.
B. Atoms of different elements are present.
C. The number of nucleons is not conserved.
D. The numbers of neither nucleons nor atoms are conserved.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.