Monday, 26 March 2012
James Chadwick
James Chadwick was born on October 20, 1891. During the first world war, Chadwick was away in Germany on a scholarship, which resulted in him being detained and kept as a civillian prisoner of war for four years. After his release we returned to his home of England to carry out research at Cambridge University. Soon after he was appointed assistant director of the lab by none other than Ernest Rutherford. Chadwick's personal research was focused on radioactivity. Chadwick's own contribution to science prooves the existence of the neutron and as constiderably sped-up reasearch in nuclear physics today.
Niels Bohr
Niels Bohr is widely considered to be the pioneer of Modern Physics. He was born on October 7, 1885 in Copenhagen, Denmark and as made a significant contribution to science today, contributions such as helping the understanding of the structure of properties of atoms. He was the winner of the 1922 Nobel Prize for physics solely for his work on the atomic structure. He also holds a doctorate in this area of science. He described the way atoms emit radiation, by suggesting that when an electron jumps from an outer orbit to an inner one, that it emits light. This theory was later expanded into the area of Quantum Physics.
- “The opposite of a correct statement
is a false statement. But the opposite of a profound truth may well be
another profound truth.”
- NIELS BOHR
Sir Joseph John Thomson
Joseph John Thomson was born in Cheetham
Hill, Manchester, on December 18, 1856. In 1870 he enrolled at Owens
College, and in 1876 transferred to Trinity College, Cambridge as a
minor scholar. In 1897 the British physicist conducted a series of
experiments, studying the nature of electric discharge in a high-vacuum
cathode-ray tube, and found the electron. This, at the time, was being
examined by various other scientists. Thomson received various
awards; in 1906 J.J. Thomson was awarded the Nobel Prize in Physics, "in
recognition of the great merits of his theoretical and experimental
investigations on the conduction of electricity by gases". Joseph was
knighted in 1908. J.J Thomson died August, 30 1940.
Ernest Rutherford
Ernest Rutherford was born in New Zealand in 1871. After winning a scholarship to Canterbury College, Christchurch, he began his reasearch into magnetic viscosity. Shortly, after he was accepted into Trinity College, Cambridge, where he carried out a series of experiments using wireless transmissions, he made the notible discovery of three types of uranium radiations. Later in 1907 he began work as a professor at Manchester University after reciving his Nobel Prize for chemisty. Ernest became president of the Royal Society from 1925 to 1930, before his death in 1937.
John Dalton
John Dalton was an English-born scientist who lived between 1766 and 1844. He earnt his living in teaching and giving lectures, and started school around the age of 12. He was a meterologist who switched upon seeing the "applications for chemistry of his ideas about the
atmosphere." He was first to suggest the Atomic theory, which proposed the following:
- All matter was composed of small, indivisible particles termed "atoms"
- Atoms of a given element possess unique characteristics and weight
- Three types of atoms exist: simple (elements), compound (simple molecules), and complex (complex molecules).
Glenn Seaborg
Glenn Seaborg was an American scientist born in Ishpeming, Michigan. His family was poor and he served his college days working a number of jobs - a stevedore, fruit-packer and laboratory
assistant. After his graduation at the University of California (in 1934), he took his education further by completing his Ph.D. at Berkeley. In the event of the second world war - he worked at the University of Chicago's Metallurgical
Laboratory. There, he helped to develop plutonium in "uranium reactors." Later, after being appointed a professor of chemistry at the University
of California (in 1946) he received a Nobel Prize for
his discovery of plutonium. He is notable for being appointed chairman of the Atomic Energy Commission by President John Kennedy himself.
Wednesday, 21 March 2012
Henry Gwyn Jeffreys Moseley
Henry Moseley was born on November 23rd in 1887 and was an English physicist. He was most notable for sorting the chemical elements on the periodic table and the concept of the Atomic number. He redefined the previous idea of the Atomic number and made a great contribution to science. He was also the inventor of the X-ray spectrometer. He later died on the 10th of August 1915.
Saturday, 17 March 2012
Dmitri Ivanovich Mendeleev
Dmitri Ivanovich Mendeleev, born 1834 in the village of Verkhnie Aremzyani, was a Russian chemist, and the first to event the world-known periodic table of elements, which serves a distinctive and useful purpose in science today. Using his table, not only did he account for the elements which exisited in his time, but also elements and their properties yet to be discovered. After becoming a teacher, Mendeleev penned Principles of Chemistry, the most clear-cut and definitive textbook of his time,and in 1869, presented his new information to the Russian Chemical Society, in a presentation entitled The Dependence between the Properties of the Atomic Weights of the Elements, where he desribed the elements in detail. Months after publishing his table, a seperate scientist by the name of Meyer came out with a design virtually the same, although there is some speculation, Dmitri Ivanovich Mendeleev is more formally known as the creator of the Periodic Table.
Aristotle
Aristotle |
Democritus
Democritus of Abdera |
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