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A radioactive substance ${ }_{88} X^{228}$ (IIA) emits $3 \alpha$ and $3 \beta$ particles to form " $Y$ ". To which group of long form of the periodic table does " $Y$ " belong ?
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VIIA
${ }_{88}^{88} X^{228} \longrightarrow{ }_{\text {IIA group }}^{85} Y^{216}+3 \alpha+3 \beta$
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