Boron family (group 13) elements:
AB, Al, Ga, In, Tl
BN, P, As
CC, Si, Ge
DO, S, Se
Answer & Solution
Correct answer: A. B, Al, Ga, In, Tl
Group 13: B (nonmetal/metalloid), Al, Ga, In, Tl (metals). General config ns² np¹. Typical oxidation state +3 (except Tl prefers +1).
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