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(B) Alkaline earth metals belong to $Group$ $2$ of the periodic table.When a radioactive element emits one $\alpha$-particle $(_{2}He^{4})$,its atomic

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$16$

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(B) Alkaline earth metals belong to $Group$ $2$ of the periodic table.When a radioactive element emits one $\alpha$-particle $(_{2}He^{4})$,its atomic number decreases by $2$,shifting its position in the periodic table by two groups to the left.Starting from $Group$ $2$:After the first $\alpha$-emission: $2 - 2 = 0$ (which corresponds to $Group$ $18$ in the periodic table).After the second $\alpha$-emission: $18 - 2 = 16$.Therefore,the resulting daughter element belongs to $Group$ $16$.

$A$ nuclide of an alkaline earth metal undergoes radioactive decay by emission of two $\alpha$-particles in succession. The group of the periodic table to which the resulting daughter element would belong is $Group$ .......

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