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(D) The Group Displacement Law describes the change in the position of an element in the periodic table upon radioactive decay.$1$. On emission of an

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$2$ groups to the left,$1$ group to the right

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(D) The Group Displacement Law describes the change in the position of an element in the periodic table upon radioactive decay.$1$. On emission of an $\alpha$-particle $(_{2}^{4}He^{2+})$,the atomic number of the parent element decreases by $2$,causing the daughter element to shift $2$ groups to the left in the periodic table.$2$. On emission of a $\beta$-particle $(_{-1}^{0}e)$,the atomic number of the parent element increases by $1$,causing the daughter element to shift $1$ group to the right in the periodic table.Therefore,the correct option is $D$.

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