5. Conclusion
The periodic table, which is over 150 years old, has proved to be a theoretical feat, bringing order and systematics to vast quantities of experimental data. The classification thus rationalizes knowledge. Finally, it should be noted that the classification is not a collection of data, but a means of organizing reference values obtained by standardization bodies, whose references are given in the For further information.
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Conclusion
Bibliography
Websites
IUPAC periodic table http://old.iupac.org/reports/periodic_table/IUPAC_Periodic_Table-21Jan11.pdf
IUPAC chemical elements http://old.iupac.org/general/FAQs/elements.html#pt
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