General Chemistry
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Arrange the oxides in increasing order from least covalent to most covalent:
SO2, As2O5, CaO, Ga2O3, Rb2O
CaO < Rb2O < As2O5 < Ga2O3 < SO2
As2O5 < Rb2O < CaO < SO2 < Ga2O3
SO2 < Ga2O3 < CaO < As2O5 < Rb2O
Rb2O < CaO < Ga2O3 < As2O5 < SO2