History of the Periodic Table
- Created by: Georgia
- Created on: 17-04-13 19:52
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- History of the Periodic Table
- In the early 1800s they could only go on atomic mass
- Until recently only two ways to categorise elements
- their physical and chemical properties
- their relative atomic mass
- had no idea of atomic structure, electrons, protons
- back then could only relative atomic mass
- therefore, that's how elements were arranged
- periodic pattern noticed so that's why is called periodic table
- therefore, that's how elements were arranged
- Until recently only two ways to categorise elements
- Newlands' law of octaves was first good effort
- man called Newlands had first good way of arranging table in 1864
- noticed that every eighth element had similar properties
- so listed known elements in rows of seven
- idea broke down when reached transition metals
- left no gaps so work was ignored
- work was ignored because...
- groups contained elements that didn't have similar properties
- e.g carbon and titanium
- mixed up metals and non-metals
- e.g oxygen and iron
- didn't leave any gaps for undiscovered elements
- groups contained elements that didn't have similar properties
- noticed that every eighth element had similar properties
- man called Newlands had first good way of arranging table in 1864
- In the early 1800s they could only go on atomic mass
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