Periodic table (standard)
- Periodic table (standard)
This is a typical display of the periodic table of the elements and contains the symbol and atomic number of each element. The periodic table of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869. Mendeleev intended the table to illustrate recurring ("periodic") trends in the properties of the elements. The layout of the table has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior. [cite news | author = | title = The periodic table of the elements | publisher = International Union of Pure and Applied Chemistry | date = 2007-07-22 | url = http://www.iupac.org/didac/Didac%20Eng/Didac01/Content/S01.htm| accessdate=2008-02-08] The periodic table is now ubiquitous within the academic discipline of chemistry, providing an extremely useful framework to classify, systematize and compare all the many different forms of chemical behavior. The table has also found wide application in physics, biology, engineering, and industry. The current standard table contains 117 confirmed elements as of 2008-01-27 (while element 118 has been synthesized, element 117 has not).
Table
"This common arrangement of the periodic table separates the lanthanides and actinides from other elements. The wide periodic table incorporates the f-block. The extended periodic table adds the 8th and 9th periods, incorporating the f-block and adding the theoretical g-block.
PeriodicTablesKey
See also
*Periodic table
*Periodic table (block)
*Periodic table (wide)
*Periodic table (extended)
*Table of nuclides
References
External links
* [http://www.webelements.com WebElements.com]
* [http://physics.nist.gov/PhysRefData/XrayMassCoef/tab3.html NIST's X-Ray Mass Attenuation Coefficients of Elements]
* [http://physics.nist.gov/PhysRefData/XrayMassCoef/tab1.html NIST's Table of Physical Properties of Elements]
* [http://periodic.lanl.gov/ Los Alamos version] (for American school children, but contains more of the history)
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periodic law — /pear ee od ik, pear /, Chem. 1. the law that the properties of the elements are periodic functions of their atomic numbers. 2. Also called Mendeleev s law. (originally) the statement that the chemical and physical properties of the elements… … Universalium
