PT#2-9-09-11 - 9-09-111Atoms and Order(How the physicists...

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Unformatted text preview: 9-09-111Atoms and Order(How the physicists captured the Periodic Table #2)Lynn A. MeltonUniversity of Texas at DallasSeptember 9, 2011Mendeleev and the Periodic Table9-09-112His rows correspond to our columns.Mendeleev was thefirst to predict elementsthat had not yet beendiscovered.Not everything is right.Physicists and AtomsAfter Moseley, the periodic table was reconstructed based on atomic number rather than atomic weight.The atomic weight of Cobalt [Z=27] (58.93) is greater than the atomic weight of Nickel [Z = 28] (58.69). Moseleys work led to this change ( and others).9-09-113Physicists and AtomsMendeleev was not clear about the difference between atoms and elements.An element is a group (more than one) of atoms with the same atomic number.9-09-114Nomenclature(important)AzXX is the symbol for the atom, i.e, C for carbonA (left superscript) is the atomic weight (generally rounded to the nearest integer)Z (left subscript) is the atomic number9-09-115Physicists and Atoms...
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This note was uploaded on 10/15/2011 for the course MISC. 101 taught by Professor Multiple during the Spring '11 term at University of Texas at Dallas, Richardson.

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PT#2-9-09-11 - 9-09-111Atoms and Order(How the physicists...

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