how do i know which valency to use while forming a chemical equation, a atom has many valencies. For example
valency of iron 2 and 3
valency of copper is 1 and 2
and so on
Now, while forming a compound, you aren't going to all the valencies a atom has so how do I know which valency to choose
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Most of the times the valency is given in the questions... In exam mostly they give the valency to use.