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Periodic tables

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  • Alternative periodic tables — are chemical element displays different from the well known Mendeleev periodic table. Several have been devised often purely for didactic reasons as not all correlations between the chemical elements are effectively captured by the standard… …   Wikipedia

  • Periodic table — This article is about the periodic table of the elements . For other uses, see The Periodic Table. The periodic table of the chemical elements (also known as the periodic table or periodic table of the elements) is a tabular display of the 118… …   Wikipedia

  • 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

  • History of the periodic table — The history of the periodic table reflects over a century of growth in the understanding of chemical properties, and culminates with the publication of the first actual periodic table by Dmitri Mendeleev in 1869.[1] While Mendeleev built upon… …   Wikipedia

  • Extended periodic table — There are currently seven periods in the periodic table of chemical elements, culminating with atomic number 118. If further elements with higher atomic numbers than this are discovered, they will be placed in additional periods, laid out (as… …   Wikipedia

  • Group (periodic table) — The periodic table of the chemical elements. The columns represent the groups In chemistry, a group (also known as a family) is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table,… …   Wikipedia

  • Substantially equal periodic payments — (SEPP) are one of the exceptions in the United States IRS Code that allows receiving payments without the 10% early distribution penalty from a retirement plan or deferred annuity before the usual 59 1/2 age restriction under certain… …   Wikipedia

  • Metalloid —   13 14 15 16 17   2  B Boron …   Wikipedia

  • Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …   Wikipedia

  • Dmitri Mendeleev — in 1897 Born 8 February 1834( …   Wikipedia

  • Transition metal — The term transition metal (sometimes also called a transition element) has two possible meanings: The IUPAC definition[1] states that a transition metal is an element whose atom has an incomplete d sub shell, or which can give rise to cations… …   Wikipedia

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