Noun
periodic table- A tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same column
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...The periodiс table of the chemical elements (also Mendeleev's table, periodic table of the elements or just periodic table) is a tabular display of the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869, who 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. IUPAC article on periodic table Read full entry
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- Periodic Table at Bing™
- Sort Elements by State, Formation, & More. Try Visual Search Today.
- www.Bing.com/VisualSearch
- 1.A Periodic Table of the Elements at Los Alamos National Laboratory
- The Chemistry Division's Periodic Table describes the history, properties, resources, uses, isotopes, forms, costs, and other information for each element.
- http://periodic.lanl.gov/defau
lt.htm
- 2.Periodic table - Wikipedia, the free encyclopedia
- Mendeleev intended the table to illustrate recurring ("periodic") trends in the ... The periodic table is now ubiquitous within the academic discipline of chemistry, ...
- http://en.wikipedia.org/wiki/P
eriodic_table
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Periodic Table?
What happens to the number of
electron shells as you go
across the periodic table?
Down the peridic table?
What happens to the number of
electrons in the outside shell
as you go across the periodic
table? Down the periodic
table?
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Earlier attempts to list the elements to show the relationships between them had usually involved putting them in order of atomic mass. Mendeleev's key insight in devising the periodic table was to lay out the elements to illustrate recurring ("periodic") chemical properties (even if this meant some of them were not in mass order), and to leave gaps for "missing" elements. Mendeleev used his table to predict the properties of these "missing elements", and many of them were indeed discovered and fit the predictions well. With the development of theories of atomic structure (for instance by Henry Moseley) it became apparent that Mendeleev had listed the elements in order of increasing atomic number (i.e. the number of protons in the atomic nucleus). This sequence is nearly identical to that resulting from ascending atomic mass. In order to illustrate recurring properties, Mendeleev began new rows in his table so that elements with similar properties fell into the same vertical columns ("groups"). With the development of modern quantum mechanical theories of electron configuration within atoms, it became apparent that each horizontal row ("period") in the table corresponded to the filling of a quantum shell of electrons. In Mendeleev's original table, each period was the same length. Modern tables have progressively longer periods further down the table, and group the elements into s-, p-, d- and f-blocks to reflect our understanding of their electron configuration. In printed tables, each element is usually listed with its element symbol and atomic number; many versions of the table also list the element's atomic mass and other information, such as its abbreviated electron configuration, electronegativity and most common valence numbers. As of 2006, the table contains 117 chemical elements whose discoveries have been confirmed. Ninety are found naturally on Earth, and the rest are synthetic elements that have been produced artificially in particle accelerators. Elements 43 (technetium) and 61 (promethium), although of lower atomic number than the naturally occurring element 92, uranium, are synthetic; elements 93 (neptunium) and 94 (plutonium) are listed with the synthetic elements, but have been found in trace amounts on earth =] |
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What is the periodic table I need to know how is the
periodic table is used for in
Biology and Physics? What
information can you gather
using the table and use it in
biology/physics? Also, what
industries use the periodic
table...some links to
information on the industries
would help.
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the periodic table can be used to figure out compounds, like H2O which is water. it also shows many other characteristics of the elements in the periodic table....hopefully this is the periodic table that im thinking it is....lol http://www.webelements.com/ http://periodictable.com/ http://periodic.lanl.gov/defau lt.htm |
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How does the periodic table And if possible if you could
answer this too.
Why do physical properties,
such as state and electrical
conductivity, also show
patterns in the periodic
table?
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In a few words, properties of elements (both chemical properties, like oxidative properties and physical properties, like conductivity) change periodically because electron configurations of atoms change periodically |
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