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John A. R. Newlands • chemical properties repeated every eight elements for
the first few • named this the octave rule (compared it to a musical
scale) • Some less observant members of the English
Chemical Society considered this absurd, • his work was ignored for years.
H
Li Be B C N O F
Na Mg Al Si P S Cl
do re mi fa so la ti
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• “I began to look about and write down the elements with their atomic weights and typical properties, analogous elements and like atomic weights on separate cards, and this soon convinced me that the properties of elements are in periodic dependence upon their atomic weights.”
Mendeleev
• http://www.aip.org/history/curie/periodic.htm
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• Look at the two slides on Pg 3 & 4. How do they line up?
• Now look at the two slides on pg 4 & 5. How did Mendeleev’s first table compare to the one we know now. Find at least 5 differences.
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Draft for first version of Mendeleev's periodic table (17 February 1869).
Courtesy Oesper Collection, University of Cincinnati. http://www.chemheritage.org/EducationalServices/chemach/ppt/lm01.html
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Ti=50 Zr=90 V=51 Nb=94 Ta=182 Cr=52 Mo=96 W=186 Mn=55 Pt=197Fe=56 Ru=104 Ir=198 Ni=Co=59 Pd=106 Os=199
H=1 Cu=63 Ag=108 Hg=200 Be=9 Mg=24 Zn=65 Cd=112 B=11 Al=27 Ur=116 Au=197C=12 Si=28 Sn=118 N=14 P=31 As=75 Sb=122 Bi=210O=16 S=32 Se=79 F=19 Cl=35,5 Br=80 J=127
Li=7 Na=23 K=39 Rb=85 Cs=133 Tl=204 Ca=40 Sr=87 Ba=137 Pb=207
La=94
Di=95
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H
Li Be B C N O F
Na Mg Al Si P S Cl
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn As Se Br
Rb Sr Zr Nb Mo Ru Rh Pd Ag Cd In Sn Sb Te I
Cs Ba Lu Hf Ta W Os Ir Pt Au Hg TI Pb Bi
La Ce
Th U
Known Elements at the time of Mendeleev
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http://www.privatehand.com/flash/elements.html
http://www.youtube.com/watch?v=DYW50F42ss8
http://www.youtube.com/watch?v=GFIvXVMbII0&NR=1
Go to each of the following links. Describe what is different from one to the next.
How many elements (if any) were discovered after this song was written?
What did each one help you figure out if anything?