Early periodic tables were incomplete, since many elements were unknown. Also, some elements were placed in groups with elements that were not similar to them. Mendeleev left gaps in his table for ...

You'll find it on the wall of nearly every school chemistry laboratory in the land. And generations of children have sung the words, "hydrogen and helium, lithium, beryllium..." in an attempt to ...

This year marks the 150th anniversary of the publication of Mendeleev’s Periodic Table of Chemical Elements in 1869. In celebration, the United Nations Educational, Scientific, and Cultural ...

THE statement appears in NATURE of April 28, p. 656, that “Mendeléeff's first table, published in 1871, bears a remarkable resemblance to that of the present day”. As a matter of fact, Dmitri ...

The iconic chart of elements has served chemistry well for 150 years. But it’s not the only option out there, and scientists are pushing its limits. By Siobhan Roberts When Sir Martyn Poliakoff, a ...