When $_{90}T{h^{228}}$ transforms to $_{83}B{i^{212}}$, then the number of the emitted $\alpha$- and $\alpha$- particles is, respectively
When $_{90}T{h^{228}}$ transforms to $_{83}B{i^{212}}$, then the number of the emitted $\alpha$- and $\alpha$- particles is, respectively
- A
$8\,\alpha ,\,7\beta $
- B
$4\,\alpha ,\,7\beta $
- C
$4\,\alpha ,\,4\beta $
- D
$4\,\alpha ,\,1\beta $
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