Early Periodic Table
During the 19th century many scientists tried to find ways of classifying elements based on their properties and atomic weights.
In 1863 Newlands proposed his law of octaves which stated that similar properties were found every 8th element.
- He put the 56 elements into 7 groups according to their atomic weights.
- However their properties did not match well, meaning other scientists didnt accept his idea.
In 1869 Mendeleev produced a better table by leaving gaps for undiscovered elements.
- When some of the missing elements were discovered, they were found to have the properties predicted by Mendeleev, other scientist then accepted his idea.
- Mendeleev's table became the basis for the modern periodic table.
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