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What problem arises in trying to predict the type of compound formed by the reaction of gold and selenium?

I honsetly have no Idea like Ihave read researched whn I was looking for some help I stumbled across this website and i was hoping you guys could help a brother out thanks!

I am no expert on Au but I have learned from my copy of Advanced Inorganic Chemistry (Fifth Ed) by Cotton and Wilkinson that Au exists as a myriad of oxidation states of -1, 0, +1, +2, +3 and +5. Also, Au tends to form complexes, such as AuCl4^- as opposed to the compound AuCl3. That coupled with the fact that Au and Se have almost the same electronegativity (Au is 2.54 and Se is 2.55) and Se has multiple oxidation states of -2, +4 and +6, I think it would be difficult to predict the type of compound. It might, for example, be a straight compound, such as Au2Se3 or the Au might be found as a complex of some type. I hope this helps. And do come back if you have other questions. We are always happy to see new faces.

What does this problem indicate about the completeness of the rules and theories for ionic compounds?

They need some fine tuning?

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