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What is the charge on the Cr in the ionic compound Cr2O3?


Question asked by: knowitall

Ah yes, good old chemistry homework questions! Well, to work out what the charge must be on the chromium, lets look at what you have:
Cr2O3

Ok, so you have two chromium and three oxygen atoms. You know this is a salt and therefore the charges must balance out. What possible values will do this? Well, since there are different numbers of each atom then the first thing you know is that the charge on the Cr must be different to that on the Oxygen.

And since there are less Cr, then the charge must be greater on this than on the Oxygen. Therefore the lowest values that will balance are 3 for Cr, and 2 for Oxygen. Therefore this is the answer.

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Question Keywords

ionic  compound  cr2o3  charge  

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