(A) The correct answer is $IIA$ (Alkaline Earth Metals). In group $IIA$,all elements $(Be, Mg, Ca, Sr, Ba, Ra)$ are metals. In group $IIIA$,$B$ is a m

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(A) The correct answer is $IIA$ (Alkaline Earth Metals). In group $IIA$,all elements $(Be, Mg, Ca, Sr, Ba, Ra)$ are metals. In group $IIIA$,$B$ is a metalloid. In group $IVA$,$C$ is a non-metal and $Si, Ge$ are metalloids. In group $VIIA$,$F, Cl$ are non-metals.