Atomic mass number of an element thorium is $232$ and its atomic number is $90$. The end product of this radioactive element is an isotope of lead (atomic mass $208$ and atomic number $82$). The number of alpha and beta particles emitted is
Atomic mass number of an element thorium is $232$ and its atomic number is $90$. The end product of this radioactive element is an isotope of lead (atomic mass $208$ and atomic number $82$). The number of alpha and beta particles emitted is
- A
$\alpha = 3,\;\beta = 3$
- B
$\alpha = 6,\;\beta = 4$
- C
$\alpha = 6,\;\beta = 0$
- D
$\alpha = 4,\;\beta = 6$
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