Thallium and oxygen form two compounds with the following characteristics:

Determine the chemical formulas of the two compounds.

(b) Determine the oxidation number of thallium in each compound.

(c) Assume that the compounds are ionic and write the electron configuration for each thallium ion.

(d) Use the melting points to decide which compound has more covalent character in its bonds. Is your finding consistent with what you would predict from the polarizing abilities of the two cations?

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Mass percentage Tl Melting point Compound I 89.49% 717 °C Compound II 96.23% 300 °C