By Blakley Brown
The symbol for Potassium is a K. Its atomic number is 19 and has a mass number of 39.09. It's in period 4 in group 1. It is apart of the Alkali metals group making it very reactive. It's a metal and is used for fertilizers, salt substitutes and soap believe it or not. It is also a solid.
It is a common ingredient in almost all fertilizers.
If you dont want to use regular salt, there is also salt substitute and potassium is in that.
Almost all soaps have potassium in them.