The Early Periodic Table
- Created by: s12047
- Created on: 14-11-16 20:53
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- The Early Periodic Table
- The Earliest Philosophers
- Water
- Earth
- Air
- Fire
- Robert Boyle was the first scientist to define an element.
- The use of electricity allowed scientists to discover lots of new elements.
- The scientists began to record the melting point, the boiling point, the atomic mass and the way they reacted.
- Scientists knew certain things about elements.
- Alkali metals all react in water. They are all in group 1.
- However, they did not know how these elements were linked.
- Dmitri Mendeleev
- Dmitri Mendeleev was the first to figure out how to group the elements into a periodic table. This was published in 1869.
- He organised the elements in order of the atomic mass. Unlike Newlands, he realised that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them into groups with similar properties that fell in columns.
- As not all the elements had been discovered he left gaps for them. When they were discovered, they were found to fit, confirming his ideas.
- Mendeleev's periodic table is the basis of the modern periodic table.
- John Newlands
- He organised all the known elements into a table in order of relative atomic mass.
- 1864- put forward his law of octaves.
- Once he had done this he found that each element was similar to the element 8 places on.
- However it did have problems. Iron was put into the same group as oxygen and sulphur. As a result, he was not taken seriously.
- The Earliest Philosophers
- John Newlands
- He organised all the known elements into a table in order of relative atomic mass.
- 1864- put forward his law of octaves.
- Once he had done this he found that each element was similar to the element 8 places on.
- However it did have problems. Iron was put into the same group as oxygen and sulphur. As a result, he was not taken seriously.
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