The day celebrates the challenges chemists overcame to develop the modern periodic table. English chemist John Newlands published one of the first tables of elements on Feb. 7, 1863.
(THE CONVERSATION) If you want to know what happened in the earliest years of the universe, you are going to need a very big, very specialized telescope. Much to the joy of astronomers and space fans ...
The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...