Timeline of Elements?
*500 BC- 1720: Alchemists used Ancient Art, during the middle Ages, to discover a substance that would change common metals to gold or silver.
*442 BC: Democritus came up with the theory of atoms, and also he stated that the universe is made up of empty space and that all matter is composed of indivisible atoms.
*384 - 322 BC: Aristotle developed techniques for gathering scientific facts. His progress provided the basis for scientific work more than a millennium.
*1777: Lavoisier, a French chemist, who proved the conversation of matter and explained the mysteries of fire.
*1780s: Coulomb formed the Coulomb's Law; the force one timy charged object exerts on a second one is proportional to the amount of charge on one times the amount of charge on the others and inversely proportional to the square of the distance between them. The formula for this is F= Q1*Q2/r"
*1803: John Dalton, an English chemist, who proposed the Atomic Theory that all matter was composed of tiny indivisible particles known as atoms. These atoms acquire unique characteristics and weight for different elements. He also declared three types of atoms exist: simple, compound, and complex.
*1870s: Crookes developed the Crookes tube and used it to produce cathode rays for the first time.
*1895: W.K. Roentgen discovered X-Rays.
*1896: Becquerel, a French physicist, found that rays coming from a uraninum ore affected a photographic plate like X-Rays did. The rays were more powerful than those from a sample of pure uranium. His experiment led to the discovery of natural radioactivity.
*1898: The Curies studied and identified radioactive elements.
*1898: J.J. Thomson was the first to measure the electron. He developed the plum-pudding model of the atom.
*1900: Max Planck stated that radiation is quantized.
*1905: Albert Einstein proposed the quantum of light in...
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John Dalton and His Atomic Theory
... of Dalton's ideas were acquired from other chemists at the time such as Lavoisier and Higgins However, Dalton was the first to put the ideas into a universal law of atomic theory, undoubtedly ...
John Dalton: the father of modern chemistry.
... (http://www.wikipedia.org/wiki/John+Dalton) Prior to Dalton, the accepted theory about atoms was that of ... John Dalton was born in England in 1766. He was the son of a weaver and attended a Quaker school. He was intelligent at a very early age; he even began teaching at the Quaker school at the age of ...
The Life of John Dalton.
... Dalton, John (b. Sept. 6, 1766, Eaglesfield, Cumberland. Eng.- d. July 27, 1844, Manchester), British chemist and physicist who developed the atomic theory of matter and hence is known as one of the fathers of modern physical science. Dalton was ...
Biography on John Dalton
... John Dalton an English chemist and physicist, was known to us for his atomic theory. Born in 1766, September, and taught by his father. He started teaching people at the young age of 12, but since he was discontent with the ...
NSW HSC CHEMISTRY - the development of rubber and electrolysis of Sodium Hydroxide the products and their uses.
... resultant atoms may be liberated as a gas, or deposited as a solid on the electrode, in amounts that are proportional to the amount of current passed, as discovered by English chemist Michael ...
History of Atomic Theory
... DEVELOPMENT Year Milestone Scientist(s) ~400 BC The first coherent atomic theory Democritus 1804 First "modern" atomic theory J. Dalton 1869 First periodic table D. Mendeleev 1896-9 Radioactivity discovered ...
Atomic Enegy
... The atom and its mysteries have been on the mind of scientists and man since Dalton came up with the Atomic Theory in ... pure nuclear material, without any of the external electrons or empty space, would weigh more than a billion tons ( 2,000,000 ...
History: Development of the Atomic Model
... this atoms were disregarded and pushed into the background. In 1803 English meteorologist suggested an atomic theory. This man was called John Dalton. He stated again what the two ancient Greeks ...