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The formulae of the oxides of two elemen...

The formulae of the oxides of two elements X and Y are `XO" and "Y_(2)O_(3)` respectively.
(i) Find the valencies of X and Y.
(ii) Identify the groups .in which they would be placed in the Modern Peri-odic Table.
(iii) Name one more element belonging to each of these groups.

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