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Is there any trick to find the valencies?

Is there any trick to find the valencies?
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Is there any trick to find the valencies?

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User Igor Nikiforov
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You can find the number of valence electrons by knowing the elements main group number.

For example, Oxygen is in group 6 of the periodic table and its valence electrons are 6.

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User Sanja Melnichuk
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