Which of the following group 13 elements is a non-metal?

AIndium
BAluminium
CBoron
DGallium

Answer: C

Group 13 shows a change from non-metal to metal on going down. Boron, the smallest and most electronegative member, is a non-metal (a metalloid), whereas Al, Ga, In and Tl are metals. Hence boron.

Practice p-Block Elements: Groups 13 and 14 More on Trends in group 13 and group 14

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