how to find the valency of any element (formula )
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The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.
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see the molar chart in 10textbook
i am not in class 10
then search in Google
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