Tags » Periodic Table

1807 : Humphry Davy’s Experiments

Humphry Davy delved into the developing field of electrochemistry to become its most popular, colorful, and inventive proponent in the public eye. He proposed that chemical reactions generate currents, and discovered several elements reversing the process to separate elements with the aid of a current, a process dubbed electrolysis.

Chemistry

1811 : Avogadro’s Essay on a Manner of Determining the Relative Masses…

Avogadro synthesized both Dalton’s and Gay-Lussac’s works to propose the hypothesis that equal volumes of gases contain an equal number of molecules within the same conditions. 28 more words

Chemistry

1860 : Invention of the Spectroscope

Robert Bunsen and Gustav Kirchhoff invented an instrument called the spectroscope, which displays a unique spectrum of light for any given element. This introduced a certain method for identifying new elements, and encouraged chemists to seek them out.

Chemistry

1860 : Meeting of the International Congress of Chemists in Karlsruhe

For the first time, an international assembly met for the purposes of agreeing upon conventions for the practice of chemistry. Practitioners of the science both academic and industrial were invited and attended. 23 more words

Chemistry

1869 : Mendeleev Publishes First Periodic Table

Mendeleev proposed an organizational model for the elements based upon periodically recurring properties, which won out amongst a host of other attempts to organize the elements in a meaningful way.

Chemistry

1898 : Marie and Pierre Curie’s Discovery of Radioactivity

Upon discovering two new elements, which they dubbed polonium and radium, the Curies introduced a brand new field to physics: radioactivity. The resulting experiments revealed the lucrative possibilities radiation offered to studying subatomic physics and suggested a revision of the fundamental principles of mechanics would likely soon take place.

Physics

1913 : Moseley Publishes Moseley’s Law

By applying x-rays to each element, Moseley discovered each had a unique pattern. His Law, derived from an analysis of these patterns, provided mathematical justification for the atomic numbers assigned to the elements and thereby their placement on the periodic table.

Physics