What is valency? How does it along a period
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Answer: The valency 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 samevalency because they all have the same number of electrons in the outer shells. Acrossthe a period, the number however increase by 1.
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The combining power of an atom of an element is called the valency of an atom.
In a Period valency first increases from 1 to 4 then movies back to 1 and lastly goes to 0 (NOBLE GASES)
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