need it urgently .......Based on the group valency of elements state the formula for the following giving justification :
(i) oxides of the 1st element.
(ii) halides of the elements of group 13
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(i) X2O (e.g. Na2O)
(ii) XCl3 (e.g. AlCl3)
(ii) XCl3 (e.g. AlCl3)
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