This week we learned about the periodic system the periodic system consists of elements all organized according to atomic number from left to right. There are also still other elements to be discovered elements  are all either a solid, a liquid, a non-Newtonian fluid, or they are an unknown which is a category mostly for the newest discovered elements. Because they are only there for a second before they disappear. The periodic table was discovered by Dmitri Mendeleev who was teaching a class and then to organize the elements for the class he created the periodic table.