Dmitri Mendeleev

I saw a table where the elements were arranged in order of their atomic weights, and I immediately understood that this was the key to understanding the properties of matter.

The elements, if arranged according to their atomic weights, exhibit an evident periodicity of properties.

When I arranged the elements according to the magnitude of their atomic weights, I was convinced that there was a periodicity of properties.

The properties of the elements are in periodic dependence upon their atomic weights.

I have been looking for some time for a general law governing the properties of the elements, and I have found it in the periodic system.

The periodic law enables us to predict the properties of unknown elements.

The future will show that the periodic law is a powerful tool for chemical research.

Without the periodic law, chemistry would be a chaos of facts.

The periodic law is a natural law, and it is therefore universal.

The periodic law is a guide for the chemist in his investigations.

The periodic law is not an arbitrary invention, but a reflection of the inherent order of nature.

There is nothing in the world that cannot be explained by the periodic law.

The periodic law is the most important generalization in chemistry.

The periodic law has transformed chemistry from a descriptive science into a predictive one.

The periodic law is a testament to the power of human reason.

The periodic law is a beautiful and elegant expression of the order of the universe.

The periodic law is a living law, constantly evolving and expanding.

The periodic law is a bridge between the known and the unknown.

The periodic law is a tool for discovery, not just for organization.

The periodic law is a triumph of scientific thought.