History of Periodic Table
History of periodic table
- Created by: ? Secret - Team GR
- Created on: 22-10-12 22:19
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- History of Periodic Table
- Johan Dobereiner
- 1. Noticed several groups where 3 elements have similar properties
- 2. Each group, the relative atomic mass oft he middle element was the eman of the other two
- A German Scientisit in the early 1800's
- Dimitri Mendeleev
- A russian scientist
- 1. He lined up atoms in order of the relative atomic mass
- 2. Realised not all missing elements have been discovered
- 4. Predicted properties of the mssing element
- 3. Left gaps for missing elements to produce a sensible pattern
- John Newlands
- English Chemist
- 1. Arranged known elements in order of the relative atomic mass
- 2. Saw every eigth element had similarities like an OCTAVE
- 3. ONLY worked for the FIRST 16 known elements
- Johan Dobereiner
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