Early Periodic Table
The creation of the periodic table
- Created by: Becky Marlton
- Created on: 13-03-13 18:14
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- Early Periodic Table
- John Dalton
- ordered in mass measured in many chemical reactions
- 1808_ first suggestion
- John Newlannds
- John Dalton
- ordered in mass measured in many chemical reactions
- 1808_ first suggestion
- Law of Octaves
- Based on observations that every 8th element had similar properties
- Thought all elements had been found
- So scientists ridiculed the idea as not all elements fitted his pattern
- Left no gaps for undiscovered elements though new ones were turning up all the time
- John Dalton
- Dmitri Mendeleev 1869
- Only 50 elements had been found
- Order of atomic mass
- Periodic pattern in their physical properties and chemical properties could be seen
- Left gaps for undiscovered elements
- predicted their properties from his table
- Compared to the modern periodic table
- no transition elements
- Only 50 elements had been found
- now they are ordered by atomic number
- no transition elements
- John Dalton
- Compared to the modern periodic table
- no transition elements
- now they are ordered by atomic number
- no transition elements
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