Question

if a nucleus of an atom which has 92 protons and 146 neutrons releases an alpha radiation, what will be the resulting charge and mass of the new nucleus? what is the symbol of this new isotope?

Answer 1

238U_92 → 4He_2 + 234Th_90

The resulting charge of the new nucleus will be +90, mass of the new nucleus will be 234. Th is the symbol of new isotope.