Question

Define vallency. Pls fast

Answer 1

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 was successful in explaining the molecular structure of inorganic and organic compound.

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Answer 2

valence is that they are the combing power of element as measured by the number of hydrogen atom or can displace or combine with. normally we can say the outermost electron that is upto 4 of it is more than 4 we need minus it from 8.