Why thallium prefers to form TII istead of TIIII compounds

Posted on 2013-11-08 18:04:00 in Chemistry by JANE_WAT

(a) Why thallium prefers to form TI^I istead of TI^III compounds although it belongs to group 13 in the periodic table.

(b) AIF₃ is a very high melting solid while AICI₃ is a low melting solid.

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