The conclusion in 1902 by Sir Ernest Rutherford and myself with regard to the element thorium was of this ... has actually been crossed by science. The first phase of the study of radio-active ...

Many scientists worked on the problem of organizing the elements, but Dmitri Mendeleev published his first version of the periodic table in 1869, and is most often credited as its inventor. Since then ...

possesses considerable scientific importance, because its atomic weight of 44, as determined by Nilson, is precisely that indicated by Mendeleef for ekabor, an element the existence of which was ...

When it comes to science, chemistry is elemental. That pun is based on the fact that the main building blocks in the branch of science are chemical elements, pure substances made from a single ...

National Periodic Table Day, observed annually on February 7, honors one of the most significant achievements in scientific ...

Earliest inner solar system planetesimals shaped the inventory of moderately volatile elements in terrestrial planets.