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Dmitri Ivanovich Mendeleev (/ ˌ m ɛ n d əl ˈ eɪ ə f / MEN-dəl-AY-əf; [2] [b] [a] 8 February [O.S. 27 January] 1834 – 2 February [O.S. 20 January] 1907) was a Russian chemist known for formulating the periodic law and creating a version of the periodic table of elements.
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and extended ...
Two other inventors, Robert Douglass and John Apjohn, also patented windscreen cleaning devices in the same year. Car heater Margaret A. Wilcox invented an improved car heater, which directed air from over the engine to warm the chilly toes of aristocratic 19th-century motorists, in 1893. She also invented a combined clothes and dish washer.
Computer science: Charles Babbage Alan Turing: In the history of computer science Babbage is often regarded as one of the first pioneers of computing and Turing invented the principle of the modern computer and the stored program concept that almost all modern day computers use. Computer programming: Ada Lovelace Charles Babbage
March 6 – Dmitri Mendeleev makes a formal presentation of his periodic table to the Russian Chemical Society. June 15 – John Wesley Hyatt patents celluloid , in Albany, New York . July 15 – Hippolyte Mège-Mouriès files a patent for margarine (as oleomargarine ) in France as a beef tallow and skimmed milk substitute for butter.
First discovered 80 years ago in 1945, Promethium is a lanthanide (one of a series of 15 metallic chemicals also known as rare earth metals) with the atomic number 61, and in the following eight ...
Gerty Cori (1896–1957) Jewish Czech-American biochemist who was the first American to win a Nobel Prize in science; Margot Dorenfeldt (1895–1986) First woman to graduate from Norwegian Institute of Technology (1919) Ida Freund (1863–1914), first woman to be a university chemistry lecturer in the United Kingdom
Perey named the element francium, after her home country, and it joined the other alkali metals in Group 1 of the periodic table of elements. [3] [7] Francium is the second rarest element (after astatine) — only about 550g exists in the entire Earth's crust at any given time — and it was the last element to be discovered in nature.