By grouping the elements according to atomic structure, the Periodic Table indicates which elements are likely to have similar properties, or similar reactions with other elements and compounds. The three subdivisions of the Table are :
Groups : The vertical columns include elements with similar chemical properties e.g. alkali metals.
Periods : The horizontal rows include elements with the same number of electron shells (energy levels).
Blocks : Adjacent groups of elements where the same subshell contains the last electron.
Tuesday, 20 October 2009
periodic table
what is a periodic table ?
The periodic table of elements was devised by the Russian scientist Dimitri Ivanovich Mendeleyev in 1869. It is a system for arranging the chemical elements, from which everything in the universe is ultimately composed. The periodic table organises the elements into rows, columns and blocks in an ingenious way which reflects their chemical behaviour. The result is that elements vertically above or below one another in the periodic table tend to have similar chemical (and often physical) properties. The samples of each element provided in the Element Collection are arranged according to Mendeleyev's periodic table.
The periodic table of elements was devised by the Russian scientist Dimitri Ivanovich Mendeleyev in 1869. It is a system for arranging the chemical elements, from which everything in the universe is ultimately composed. The periodic table organises the elements into rows, columns and blocks in an ingenious way which reflects their chemical behaviour. The result is that elements vertically above or below one another in the periodic table tend to have similar chemical (and often physical) properties. The samples of each element provided in the Element Collection are arranged according to Mendeleyev's periodic table.
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