valency of Br, Ag, I, Pb, Hg, Au, Ba.
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-1,+2(+1),-1,+2,+2(+1),+1,+2
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Heyaaaa......
Br -. 1
Ag -. 1 and 3
I. - -1
Pb -. +4/-4
Hg-. 1 or 2
Au -. 1 and 3
Ba-. 2
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