How does valency vary in a group and period in the periodic table

1.	How does valency vary in a group and period in the periodic table
Answer» ency of an ELEMENT is dependent on the number of ELECTRONS in the outermost shell of the ELECTRON. In a group all constituting elements will have the same valency because they all have the same number of electrons in the outer SHELLS. Across the a period, the number however increase by 1.Brainliest .. !!

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