The<unk>  of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this<unk>  exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869. Mendeleev intended the<unk>  to illustrate recurring <unk> ") trends in the properties of the elements. The layout of the<unk>  has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior.
The<unk>  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<unk>  has also found wide application in physics, biology, engineering, and industry. The current standard<unk>  contains 117 confirmed elements as of January 27, 2008 (while element 118 has been synthesized, element 117 has not).
Periodic table
GPnotebook
Kick chart
Microbiology template
International Standard Serial Number
Theoretical plate
Dose Profile
Laboratory findings template