There are more than 400 nuclei in the periodic table that exhibit the alpha-decay phenomenon ■ 102030405060708090100110120130140150160170 NE∪ TRONS 100 R DECAY MODES T □βEC+et) β Internal Transition S □ Spontaneous Fission Stable nuclide □ Unknown decay5 There are more than 400 nuclei in the periodic table that exhibit the alpha-decay phenomenon