A nucleus of francium-221 ($^{221}_{87}\text{Fr}$) changes into a nucleus of bismuth-209 ($^{209}_{83}\text{Bi}$) through a sequence of decays. Which particles might be given off?
- A2 $\alpha$-particles and 4 $\beta^{-}$ particles
- B2 $\alpha$-particles and 4 $\beta^{+}$ particles
- C3 $\alpha$-particles and 2 $\beta^{-}$ particles
- D3 $\alpha$-particles and 2 $\beta^{+}$ particles