brief history ppt
TRANSCRIPT
A Brieft History: The Periodic Table
Hennig Brand • 1649 – Discovered the element Phosphorus. The pictures below is “red phosphorus.”
A.E. Beguyer de Chancourtois
• 1817 – Listed elements by increasing atomic mass on a cylinder.
Johann Dobereiner
• 1862 – Proposed the Law of Triads, where three elements in nature with the mass of the middle element being the average of the other two.
John Newlands
• 1863 – Classified the 56 known elements into a table with 11 groups based on properLes . Law of Octaves: any element will behave similarly to the 8th element.
Lothar Meyer
• 1864 – Developed a shortened version of the table only showing half of the known elements, in order of atomic mass and differences in behavior were due to mass.
Dmitri Ivanovich
Mendeleev • 1869 – Rearranged
elements in order of their properLes. He showed a verLcal, horizontal, and diagonal relaLonship between the 63 known elements.
Lord Rayleigh
• 1895 – Discovered argon and found it didn’t fit in the current groups. In 1898 he proposed a new group to be called zero group
Ernest Rutherford
• 1911 – Studied nuclei which led to the concept of nuclear charge.
Henry Mosely
• 1913 – Published results of x-‐ray wavelengths of elements which proved the elements are in order of atomic number.
Glenn Seaborg
• 1940 – Discovered plutonium and all elements from 94-‐102. He moved the Lanthanides and AcLnides below the table.
Current Periodic Table 2012
Different Types of Periodic Tables
Hydrogen is removed:
Pictures showing where they’re found:
3D Model:
Visual: Pictures of actual elements
Circular Model:
3D Desk Periodic Table
Interactive Periodic Tables
• hZp://www.ptable.com/
• hZp://www.chemicalelements.com/
• hZp://www.webelements.com/
• hZp://www.periodicvideos.com/
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