solution:
92U238 --> 2He4 + 90Th234 ........ Th-234 is the daughter element
.↑ ................ ↑ ........ ↑
92 protons .. α ........ 90 protons
Beta decay involves the weak force and allows a neutron to change into a proton. This means that the daughter element will have an atomic number which is one greater than the parent. In addition, since a neutron is swapped for a proton, the number of nucleons does not change, so the mass number does not change.
6C14 ----> -1e0 ..+.. 7N14 ............ N-14 is the daughter element
↑ ................. ↑ ........ ↑
6 protons .... β ........7 protons