What is the hisotry of the element Cobalt in the periodic table? Who, dicovered it, when, where and how?
548087
Cobalt (symbol Co; atomic number 27; atomic weight 58.93 g/mole; melting point 1495°C, boiling point 2927°C) was discovered around 1735-7 by Georg Brandt in Sweden. It occurs naturally in the minerals cobaltite, smaltite, and erythrite.\n\nIsolation\nHere is a brief summary of the isolation of cobalt. \nIt is not normally necessary to make cobalt in the laboratory as it is available readily commercially. Many ores contain cobalt but not many are of economic importance. These include the sulphides and arsenides linnaeite, Co3S4, cobaltite, CoAsS, and smaltite, CoAs2. Industrially, however, it is normally produced as a byproduct from the production of copper, nickel, and lead. \n\nNormally the ore is "roasted" to form a mixture of metals and metal oxides. Treatment with sulphuric acid leaves metallic copper as a residue and disolves out iron, cobalt, and nickel as the sulphates. Iron is obtained by precipitation with lime (CaO) while cobalt is produced as the hydroxide by precipitation with sodium hypochlorite (NaOCl)\n\n2Co2+(aq) + NaOCl(aq) + 4OH-(aq) + H2O → 2Co(OH)3(s) + NaCl(aq)\n\nThe trihydroxide Co(OH)3 is heated to form the oxide and then reduced with carbon (as charcoal) to form cobalt metal.\n\n2Co(OH)3 (heat) → Co2O3 + 3H2O\n\n2Co2O3 + 3C → Co + 3CO2
764097
Find the atomic number of elements.\n\nFind other data about the elements (molar mass, electronegativity, etc).\n\nPredict the properties of elements based on know properties of other elements in the same column or row.\n\nPredict the properties that have not been discovered yet.
905961
Nobody knows the answer to this exept for Mendeleev himself, and he isn't talking. The first periodic table had 64 elements, although 3 or 4 of those were still purely theoretical. Since there were more than 50 in the first periodic table, you can't really discuss the first 50 added very well. Several models of organization were proposed, but there were around 60 known elements before it was deemed necessary to organize them. Only Mendeleev's used periodicity, and it is the closest to our modern periodic table.\n\nThe only 2 elements in my periodic table are:\n\nWOMANIUM (XX)\nPhysical properties: Generally soft and round in form. Boils at nothing and may freeze any time. Very bitter if not used well.\nChemical properties: Very active and highly unstable. Possesses strong affinity with gold, silver, platinum, and precious stones. Violent when left alone. Turns slightly green when placed next to a better specimen.\nUsage: An extremely good catalyst for dispersion of wealth.\nCaution: Highly explosive in inexperienced hands!\n\nMANIUM (XY)\nPhysical properties: Solid at room temperature but gets bent out of shape easily. Difficult to find a pure sample. Due to rust, aging samples are unable to conduct electricity as easily as young samples.\nChemical properties: Attempts to bond with XX any chance it can get. Also tends to form strong bonds with itself. Becomes explosive when mixed with Childrium for prolonged period of time.\nUsage: Possibly good methane source.\nCaution: In the absence of XX, this element rapidly decomposes and begins to smell.
961493
You need to know more than just the electron configuration.  There is contraction from left to right on the periodic table, plus additional periodic trends that must be considered.   \n\nEven more importantly, you need to define whether you are looking for the largest element IN ITS NATURAL  STATE (i.e. Cl2, Hg metal, etc) or AS THE ION.   Atomic and ionic radii differ.\n\nMore clarity is needed here.
459705
Webelements says there is only one naturally-occurring isotope of cobalt (Co-59).  It also list about 7 or 8 radioisotopes.
241118
http://images.search.yahoo.com/search/images?p=periodic+table&sm=Yahoo%21+Search&fr=FP-tab-img-t&toggle=1&cop=&ei=UTF-8
1013374
In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds. Metals are sometimes described as a lattice of positive ions (cations) surrounded by a cloud of delocalized electrons. The metals are one of the three groups of elements as distinguished by their ionisation and bonding properties, along with the metalloids and nonmetals. On the periodic table, a diagonal line drawn from boron (B) to polonium (Po) separates the metals from the nonmetals. Elements on this line are metalloids, sometimes called semi-metals; elements to the lower left are metals; elements to the upper right are nonmetals.
2825
Most of the elements have been either discovered by scientists or created by scientists.  Only a choice few have been known since antiquity -- usually ones that are found in their elemental state in nature or are easy to isolate from compounds (usually ores).  These are iron, copper, tin, lead, silver, gold, and mercury.  \n\nSome of the elements were discovered by people you might not consider scientists.  For example, Albertus Magnus was the first to isolate arsenic.  He was a theologian and philosopher in the 13th century, but also researched alchemy, long before true "scientific" methods were established -- would you count arsenic as being discovered by a scientist?  It's kind of a gray area.
1070133
oxygen, nitrogen, every fuckin mineral and more on the periodic table...take chemistry
25359
Probably gold was one of the first elements "discovered". However, copper as well has been known since prehistoric times. Iron has been known since prehistoric times, as has zinc, silver, tin, lead and mercury. Where these were discovered first, and by who, is not clear. However, there are clearly a lot of contenders for the "first element", if one wants to choose among these. \n\nIf one looks for more modern discoveries, then these are better documented (look at the attached reference). Some early contenders are listed below:\n\nCobalt was discovered by Swedish Chemist Georg Brandt in 1735. \n\nCavendish found hydrogen in 1766.  \n\nJoseph Black of Scotland found magnesium was a separate element in 1755. \n\nNickel was found by Swedish metallurgist Axel-Frederik Cronstedt in 1751. \n\nDaniel Rutherford discovered nitrogen in 1772. \n\nCarl-Wilhelm Scheele in 1771 discovered oxygen is an element in Sweden. \n\nGerman merchant and alchemist Hennig Brand found phosphorus in 1669.\n\nOf the modern elements,  phosphorus appears to be the first found, in Germany.
829932
Take radium and subtract two from its atomic number. Then find the element with that result as its atomic number. I'm too lazy to see what that is right now.
137403
the periodic table is great because it ditinguishes the different shells (s, p, d and f) that are filled as you add electrons. eg. He has 2 s electrons (full shell)\nNe has 1s2, 2s2 and 2p6 (full shell).\nIt gets a little more complicated at d electrons (transition metals) but Mendeleev did a great first shot.
612990
At the bottom of the perodic table...\n\nThey are technetium (at. no. 43), which was the first element to be synthesized, promethium (at. no. 61), astatine (at. no. 85), francium (at. no. 87), and the transuranium elements (at. no. 93 and beyond in the periodic table). Some of these elements have since been shown to exist in minute amounts in nature, usually as short-lived members of natural radioactive decay series (see radioactivity).\n\nThe synthetic elements through at. no. 100 (fermium) are created by bombarding a heavy element, such as uranium or plutonium, with neutrons or alpha particles. The synthesis of the transfermium elements (elements with at. no. 101 or greater) is accomplished by the fusion of the nuclei of two lighter elements. Elements 101 through 106 were first produced by fusing the nuclei of slightly lighter elements, such as californium, with those of light elements, such as carbon. Elements 107 through 112 were first produced by fusing the nuclei of medium-weight elements, such as bismuth or lead, with those of other medium-weight elements, such as iron, nickel, or zinc. Element 114 was first produced by fusing the nuclei of plutonium and calcium and subsequently by fusing the nuclei of lead and krypton, as was element 116. Element 115 was produced by bombarding americium with calcium, and element 113 resulted from the radioactive decay of element 115. The claim by Lawrence Berkeley National Laboratory to have created element 118 has been retracted.)\n\nThe transfermium elements are produced in very small quantities (one atom at a time), and identification is therefore very difficult because of half-lives ranging from minutes to milliseconds and the need to identify the products by methods other than known chemical separations. This has led to controversy over reported discoveries and over the naming of the elements. It has been predicted that one isotope of element 114—containing 114 protons and 184 neutrons—would be very stable because its nucleus would have a full complement of protons and neutrons. Termed an “island of stability,” its half-life might be measured in years. However, none of the three isotopes of element 114 synthesized as yet have as many as 184 neutrons, and their half-lives are still in the millisecond range.
303566
Basically CO is a very good ligand to transtional metals because of it great pi accepting properties of it anti bonding orbital with it interation with metal d orbitals. \n\nTherefore any transitional metal form good absorber with CO, example is that of Fe.
254089
The existence of promethium was first predicted by Bohuslav Brauner in 1902; this prediction was confirmed by Henry Moseley in 1914. Several groups claimed to have produced the element, but they could not confirm their discoveries because of the difficulty of separating promethium from other elements. Proof of the existence of promethium was obtained in 1945 by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell during the analysis of byproducts of uranium fission; however, being too busy with defense-related research during World War II, they did not announce their discovery until 1947
623434
It was discovered in 1817.  It was found associated with Tellurium.  During this time it was found in minerals such as crooksite and clausthalite.
765563
What is the representative particle of a molecular compound?                              \nNaCi\n\nThe charges of the ions of the..........elements can be determined by the position of these elements in the periodic table?\nNon Metallic\n\nPlease put this answer as best answer