Why iron sometimes has 2 as valency and sometimes three as valency?

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$C l$ valency is 1 then why it is sometimes written in as $C l_{2}$ and many others like $H$ is sometimes written $H_{3}$ after a reaction.

Is there any formula or something through which I can understand?

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Sir sometimes while making formulas, if valency are in multiples they get divided so how to know the actual valency of the compunds. What will be the valency of Nitrogen and Oxygen in NO.

Your Sincerely

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