The Periodic Table Of Elements.
Information from WJEC GCSE Science Revision Guide.
- Created by: Jessica
- Created on: 04-05-13 12:11
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- The Periodic Table
- The arrangement
- The rows on the Periodic Table are called Periods.
- The columns are called groups.
- Some of the elements in the middle, the transition elements, have no group number.
- Background Information
- The Periodic Table is a table showing all the known elements.
- The table is arranged in a logical way that allows chemists to predict the properties of individual elements.
- Mendeléev
- The first useful 'periodic table' was developed by Dmitri Mendeléev in 1869.
- He realised that when the elements were arranged in order of relative atomic mass, their properties showed recurring patterns.
- He noticed that there appeared to be gaps in the sequence, he concluded that these gaps represented elements that had yet to be discovered.
- Using his periodic table, he successfully predicted the properties of some of the undiscovered elements.
- The elements are now arranged in order of atomic number, not atomic mass.
- The arrangement
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