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Which ionic compound is expected to form from combining the following pairs of elements? yttrium and oxygen

i put YO but its wrong

  • chem -

    YO won't do it.
    Y is in group III(or group 3 depending upon the system your prof is using); therefore, I expect its most prominent valence to be +3. Oxygen is -2; therefore, I would think to look at Y2O3 for the oxide.

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