Question

Describe functions of valency and its role of writing symbol

Answer 1

valency means one atom around orbits are there on that orbits electrons and prothons are there in last orbit which valency in that groups are periods some blocks are there last block we get last block that is valency of that atom

Answer 2

valency is the no. of electrons present in the outermost shell of an atom. eg sodium have atomic no. 11 with symbol Na its electronic configuration written as 2,8,1 in the outermost shell there is 1 electron