what is valancy ? explain it ?????
Answers
Answer:
The simple definition of valency, the combining capacity of element with respect to number of hydrogen atoms with which an atom of that element combines, does not explain as to why elements have different valencies and how chemical compounds are formed. The definition of valency does not enable us to find out the true valency of elements which forms number of compounds with hydrogen. Thus, carbon forms compounds like CH CHo CH4 and CH, where the valency, of carbon should be 4, 3, 2, 1. Actually in all these compounds valency of carbon is 4. With the knowledge of the structure of atom, the tendency of elements to combine was clearly understood and the electronic theory of valency was put forward by Kossel and Lewis in the year 1916. The valency of an element can never be negative, zero and fraction, it is always a whole number.
A measurement of the power of an atom to combine with other by the number of hydrogen atoms it can combine with is called valency.