Question

Define velency.Give velency of : iron ,oxygen,magnesium,potassium

Answer 1

Answer:

The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element.

iron : symbol : Fe

atomic number : 26

electronic configuration : 2,8,8,8

valency : 8

oxygen : symbol : O

atomic number : 8

electronic configuration : 2,6

valency : 6

magnesium : symbol : Mg

atomic number :12

electronic configuration: 2,8,2

valency : 2

potassium : symbol : K

atomic number :19

electronic configuration: 2,8,8,1

valency : 1