based on the group of valency of elements state the formula for the following ,giving justification of each -1)oxides of first group elements. 2)compounds formed when an element of groups 2 combines with an element of group 16.

based on the group of valency of elements state the formula for the fo

1.	based on the group of valency of elements state the formula for the following ,giving justification of each -1)oxides of first group elements. 2)compounds formed when an element of groups 2 combines with an element of group 16.
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