Question

how to find valancy of an element with example

Answer 1

Let ex. K (19)-2)8)8)1)
1 electrons in last shell
valancy of Potassium is 1

Answer 2

firstly u shoud know its atmic no and configurete it into k,l,m shell and no of electrons present on the last shell and the no of electron that are required to complete it that is called as valency of that element