This app shows a small part of the table of nuclids in which short notations like Th 232 (consisting of the chemical symbol and the mass number) are used for reasons of space. The number of protons is indicated at the left, the number of neutrons at the beginning of a column. Yellow color is used for alpha decay, blue color for beta decay. After you have chosen one of the decay chains in the selection field on the top right, you can see which nuclei are formed one after the other.