J.R. S. answered 06/01/23
Ph.D. University Professor with 10+ years Tutoring Experience
Not sure why you didn't like my previous answer to the same question. If they want only ONE group, then it would be F, Cl, Br
F, Cl, Br
C, Ge, Pb
J.R. S.
06/01/23
Andrew F.
My apologies. It looks like I might have accidentally asked the same question.06/01/23