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Based on the group valency of elements state the formula lot the following giving justification for each : (i) Oxides of 1st group elements, (ii) Halides

of the elements of group 13, and (iii) Compounds formed when an element of group 2 combines with, an element of group 16.


(I)X2O - Oxides of 1st group element.
(iii)XY - compounds of group 2 and group 16.
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