A uranium nucleus contains 92 protons and 143 neutrons. It emits a total of 3 $\alpha$-particles and 4 $\beta^-$ particles, producing nucleus X. How may nucleus X be represented?
- A$^{131}_{90}X$
- B$^{219}_{87}X$
- C$^{223}_{82}X$
- D$^{223}_{90}X$
Physics 9702 · AS & A Level · Atoms, nuclei and radiation