The Russian chemist Dmitri Mendeleev was the first scientist to make a periodic table similar to the one used today. Mendeleev arranged the elements by atomic mass, corresponding to relative molar mass. It is sometimes said that he played ‘chemical solitaire’ on long train journeys, using cards with various facts about the known elements. On March 6, 1869, a formal presentation was made to the Russian Chemical Society, entitled The Dependence Between the Properties of the Atomic Weights of the Elements. In 1869, the table was published in an obscure Russian journal

Before in 1817, Johann Wolfgang Döbereiner began to formulate one of the earliest attempts to classify the elements. In 1829, he found that he could form some of the elements into groups of three, with the members of each group having related properties. He termed these groups triads.

chlorine, bromine, and iodine

calcium, strontium, and barium

sulfur, selenium, and tellurium

lithium, sodium, and potassium

After in 1864, the English chemist John Newlands classified the sixty-two known elements into eight groups, based on their physical properties. Newlands noted that many pairs of similar elements existed, which differed by some multiple of eight in mass number, and was the first to assign them an atomic number. With the elements arranged in a spiral on a cylinder by order of increasing atomic weight, de Chancourtois saw that elements with similar properties lined up vertically. His 1863 publication included a chart which contained ions and compounds, in addition to the elements