CHEMISTRY THROUGH THE AGES - CHEMISTRY THROUGH THE AGES - CHEMISTRY THROUGH THE AGES
Chemistry during the 20th Century ( 1901 A.D. - 2000 A.D. )
Liquefaction of air by Georges Claude.
Views expressed in Alfred Werner's "Neuere Anshauugen" prepare the way for modern developments in inorganic chemistry and the electronic theory of valency.
The electronic theory of valency is put forward by Sir William Ramsay.
Niels Bohr devises his first model of the atom.
Rutherford produces the first man made transmutation.
Sir Alexander Fleming discovers penicillin.
In the study of big molecules and polymerisation, a group headed by Wallace Carothers makes the first synthetic fibre. Production of neoprene, first successful synthetic rubber.
Vitamins are produced synthetically.
Ion-exchange resins are developed by Adams and Leighton.
Through physical chemistry, the transistor is born, invented by the Americans Bardeen, Brattain and Shockley.
First glass with a regular crystalline molecular pattern is discovered.
Chlorophyll is synthesised from man-made matericals, an achievement of the highests order in basic research.
Isotope carabon-12 is adopted as the official standard for atomic weights.
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