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Amphoteric

Posted: Tue Nov 24, 2015 10:26 am
by Rachael_1H
Hello,

"state whether the following oxides are acidic, basic, or amphoteric:
As2O3 and Bi2O3."

The answer key states that they are both amphoteric. How would we know this?
Please explain. Thanks.

Re: Amphoteric

Posted: Tue Nov 24, 2015 11:46 am
by Chem_Mod
Oxides of the semimetal elements (in the zigzag on the periodic table) and the elements right below a semimetal tend to be amphoteric.