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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shreyasi majumdar 1
Pb is a big atom, so are Br and I. Because of their large sizes, it is difficult for the atoms to come close together to form the compound. Chlorine is stronger oxidising agent which oxidises lead to +2 to +4 oxidation state but Br and I are weaker oxidising agent not oxidise lead from +2 to +4 oxidation state. Therefore, PbI4 does not exist. Thallium triiodide does exist and it is formulated as Tl+ I3-, not Tl 3+ (I-)3. Thus, TlI3 is a Tl(+1) compound.
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