Question

what is a valency ?​

Answer 1

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In chemistry, the valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence was developed in the second half of the 19th century and helped successfully explain the molecular structure of inorganic and organic compounds.

Answer 2

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It is the combining power of an element, which is measured by calculating the number of hydrogen atoms which it has the ability to displace/Combine