Question
Thu March 26, 2015 By: Atri Mahapatra

what is valency? how are elements forming compound?

Expert Reply
Prachi Sawant
Fri March 27, 2015
Valency:
The combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.
 

Elements form compound on the basis of difference in their electronegativites. If the difference is very large, then the ionic compounds are formed in which highly electronegative element donates electron and the electropositive element accepts electron.

If the difference is small, then covalent compounds are formed by sharing of electrons.

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