(B) Among the given elements,tin $(Sn)$ exhibits the phenomenon of allotropy.$\beta$-tin (the metallic form,or white tin),which is stable at and above

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(B) Among the given elements,tin $(Sn)$ exhibits the phenomenon of allotropy.$\beta$-tin (the metallic form,or white tin),which is stable at and above room temperature,is malleable.In contrast,$\alpha$-tin (the non-metallic form,or gray tin),which is stable below $13.2^{\circ}C$,is brittle.