How was it organized?

In the year of 1862, Alexandre-Emile Béguyer de Chancourtois created the first model of the periodic table2. He arranged all of the elements, know at that time, by their atomic weights.

Alexandre-Emile Béguyer de Chancourtois

Skip to the year of 1869. dmitri mendelee has made his own periodic table. And this time his periodic table method is going to stay.

He organized it the same way everyone else did it. By the weight of the element itself. One of the things that he has done differently is that he has left spaces for the elements that has not been discovered yet. He did this so well that he was able to determine the properties of five elements.

What is Periodic Law?

Periodic law is something that states that inside of the periodic table, both the physical and the chemical properties reoccur on the periodic table. This is only when the elements are ordered by their periodic weights.