When was tin discovered?
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It's been around for along time:\n\nTin (anglo-Saxon, tin, Latin stannum) is one of the earliest metals known and was used as a component of bronze from antiquity. Because of its hardening effect on copper, tin was used in bronze implements as early as 3,500 BC. Tin mining is believed to have started in Cornwall and Devon ( esp Dartmoor) in Classical times, and a thriving tin trade developed with the civilizations of the Mediterranean. However the pure metal was not used until about 600 BC.
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Moissan was the first to *isolate* fluorine, no small feat - but the first person to identify it as a chemically-unique element (though in combination) was Scheele in 1771.
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Titanium was discovered in 1791 by Mr.Gregor, but it was not named until 1795.  It was first isolated by Hunter in 1910, by heating TiCl4 with sodium in a steel bomb at temperatures from 700-800 C.  That's pretty hot!\n\nTitanium is the ninth most abundant metal in the earth's crust.  That's a lot of titanium!\n\nIt is only about $6 to buy a pound of titanium. That's less than going to the movies! That's more like popcorn and pop at the movies.  heck, I'd just get some titanium.\n\natomic number: 22\n\natomic mass: 47.867 g\n\ncommon oxidation states: 2,3,4\n\nphysical appearance:  a beautiful lustrous white metal\n\nmelting point: 1660 degrees C \n\nboiling point: 3287 degrees C\n\ncrystal structure: hexagonal closest packed\n\n density: 4507 kg m3\n \n\nelectronegativity: 1.54 Pauling units\n\nground state electron configuration: [Ar]3d24s2
692483
http://www.haruteq.com/tin-02.htm
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4.5 billion years. \n\nCheck with the US Geological Survey for a great timeline and all the data to back it up, based on radioisotopes of minerals found in rocks.
463143
In 1869 when the periodic table first was created by Mendeleev.  The element was first isolated in 1774.
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Well, rainbows (which are a spectrum) have been known for ages and ages. That crystals will produce rainbows has also been known for ages. Newton was the first person to seriously investigate the properties of light using prisms. The discovery of spectral *lines* was later, but I'm not sure by whom. But it was mostly done by the late 1800's. As a point of interest, Helium was first discovered through the spectrum of sunlight and only later found on earth.
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Superconductivity was discovered in 1911 by Heike Kamerlingh Onnes, who was studying the resistivity of solid mercury at cryogenic temperatures using the recently-discovered liquid helium as a refrigerant. At the temperature of 4.2 K, he observed that the resistivity abruptly disappeared. For this discovery, he was awarded the Nobel Prize in Physics in 1913.\n\nIn subsequent decades, superconductivity was found in several other materials. In 1913, lead was found to superconduct at 7 K, and in 1941 niobium nitride was found to superconduct at 16 K.\n\nThe next important step in understanding superconductivity occurred in 1933, when Meissner and Ochsenfeld discovered that superconductors expelled applied magnetic fields, a phenomenon which has come to be known as the Meissner effect. In 1935, F. and H. London showed that the Meissner effect was a consequence of the minimization of the electromagnetic free energy carried by superconducting current.\n\nIn 1950, the phenomenological Ginzburg-Landau theory of superconductivity was devised by Landau and Ginzburg. This theory, which combined Landau's theory of second-order phase transitions with a Schrödinger-like wave equation, had great success in explaining the macroscopic properties of superconductors. In particular, Abrikosov showed that Ginzburg-Landau theory predicts the division of superconductors into the two categories now referred to as Type I and Type II. Abrikosov and Ginzburg were awarded the 2003 Nobel Prize for their work (Landau having died in 1968.)\n\nAlso in 1950, Maxwell and Reynolds et. al. found that the critical temperature of a superconductor depends on the isotopic mass of the constituent element. This important discovery pointed to the electron-phonon interaction as the microscopic mechanism responsible for superconductivity.\n\nThe complete microscopic theory of superconductivity was finally proposed in 1957 by Bardeen, Cooper, and Schrieffer. Independently superconductivity phenomenon was explained by Nikolay Bogolyubov. This BCS theory explained the superconducting current as a superfluid of Cooper pairs, pairs of electrons interacting through the exchange of phonons. For this work, the authors were awarded the Nobel Prize in 1972.\n\nThe BCS theory was set on a firmer footing in 1958, when Bogoliubov showed that the BCS wavefunction, which had originally been derived from a variational argument, could be obtained using a canonical transformation of the electronic Hamiltonian. In 1959, Gor'kov showed that the BCS theory reduced to the Ginzburg-Landau theory close to the critical temperature.\n\nIn 1962, the first commercial superconducting wire, a niobium-titanium alloy, was developed by researchers at Westinghouse. In the same year, Josephson made the important theoretical prediction that a supercurrent can flow between two pieces of superconductor separated by a thin layer of insulator. This phenomenon, now called the Josephson effect, is exploited by superconducting devices such as SQUIDs. It is used in the most accurate available measurements of the magnetic flux quantum h/e, and thus (coupled with the quantum Hall resistivity) for Planck's constant h. Josephson was awarded the Nobel Prize for this work in 1973.\n\nUntil 1986, physicists had believed that BCS theory forbade superconductivity at temperatures above about 30 K. In that year, Bednorz and Müller discovered superconductivity in a lanthanum-based cuprate perovskite material, which had a transition temperature of 35 K (Nobel Prize in Physics, 1987). It was shortly found by Paul C. W. Chu of the University of Houston and M.K. Wu at the University of Alabama in Huntsville [1] that replacing the lanthanum with yttrium, i.e. making YBCO, raised the critical temperature to 92 K, which was important because liquid nitrogen could then be used as a refrigerant (at atmospheric pressure, the boiling point of nitrogen is 77 K.) This is important commercially because liquid nitrogen can be
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Actually, Technetium was discovered in platinum ore from Colombia in 1932 using x-ray spectroscopy by Walter Noddack and Ida Tacke in Berlin.  Emilio Segrè and Carlo Perrier out of Berkeley produced it artifically in 1937. Technetium is used for radiometric body imaging in the medical field.
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"The element was actually discovered by Perrier and Segre in Italy in\n1937. It was found in a sample of molybdenum, which was bombarded by\ndeuterons in the Berkeley cyclotron, and which E. Lawrence sent to\nthese investigators. Technetium was the first element to be produced\nartificially. Since its discovery, searches for the element in\nterrestrial material have been made without success. If it does exist,\nthe concentration must be very small."\n\nTellurium, a metalloid, which can be found in group 7A was first discovered by German scientist Franz Joseph Muller von Reichenstien, but was recognized 16 years later in 1798 as a element and given its name by the German chemist Martin Heinrich Klaproth. Tellurium ranks about 78th in natural abundance. It occurs in the pure state or is found in combination with gold, silver, copper, lead, and nickel in such minerals as sylvanite, petzite, and tetradymite. Tellurium meltsa about 452 degrees C, boils about 1390 degrees C, and has a specific gravity of 6.25. Tellurium is one of the rareest elements. Its compunds are toxic, and the element itself plays no known role in living organisms. Tellurium is used in manufacturing rectifiers and thermoelectric devices. It is employed as a vulcanizing agent in the processing of natural and synthetic rubber.
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Element 118 may have been found about two weeks ago:\n\nhttp://www.fogcityjournal.com/news_in_brief/bcn_livermore_labs_element_118_061016.shtml
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History\n\nThe use of Nickel is ancient, and can be traced back as far as 3500 BC. Bronzes from what is now Syria had a nickel content of up to two percent. Further, there are Chinese manuscripts suggesting that "white copper" (e.g. baitung) was used in the Orient between 1400 and 1700 BC. However, because the ores of nickel were easily mistaken for ores of silver, any understanding of this metal and its use dates to more contemporary times.\n\nMinerals containing nickel (e.g. kupfernickel, meaning copper of the devil ("Nick"), or false copper) were of value for colouring glass green. In 1751, Baron Axel Fredrik Cronstedt was attempting to extract copper from kupfernickel (now called niccolite), and obtained instead a white metal that he called nickel.
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http://en.wikipedia.org/wiki/Discovery_of_america\nPlease click the above link to know in detail.
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The discovery of oxygen
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may 29,1790\n\n\n~thanx for the points~
195584
it was only recently discovered
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Tin is a chemical element in the periodic table that has the symbol Sn (L. Stannum) and atomic number 50. This silvery, malleable POOR METAL that is not easily oxidized in air and resists corrosion, is found in many alloys and is used to coat other metals to prevent corrosion. Tin is obtained chiefly from the mineral cassiterite, where it occurs as an oxide.