A radioactive substance {}_{88}X^{228} (Group | vedclass

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(D) The initial element is ${}_{88}X^{228}$ belonging to group $IIA$ (atomic number $Z = 88$).When an element emits one $\alpha$-particle,its atomic n

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$VIIA$

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(D) The initial element is ${}_{88}X^{228}$ belonging to group $IIA$ (atomic number $Z = 88$).When an element emits one $\alpha$-particle,its atomic number decreases by $2$ and mass number by $4$.When an element emits one $\beta$-particle,its atomic number increases by $1$ and mass number remains unchanged.For the emission of $3 \alpha$ and $3 \beta$ particles:Change in atomic number $(Z)$ = $(3 	imes -2) + (3 	imes 1) = -6 + 3 = -3$.New atomic number of $Y$ = $88 - 3 = 85$.An element with atomic number $88$ is Radium $(Ra)$,which is in group $IIA$ (alkaline earth metals).Group $IIA$ elements have a valence shell configuration of $ns^2$.Atomic number $88$ is in the $7^{th}$ period. The element with atomic number $85$ is Astatine $(At)$.Astatine $(Z=85)$ belongs to the halogen family,which is group $VIIA$ (or group $17$).

$A$ radioactive substance ${}_{88}X^{228}$ (Group $IIA$) emits $3 \alpha$ and $3 \beta$ particles to form $Y$. To which group of the long form of the periodic table does $Y$ belong?

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