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The periodic table of elements is a chemistry reference that lists elements by increasing atomic number, which typically correlates to their atomic masses. The atomic number increases from left to right as well as from top to bottom. Each of the rows on the table is a period.


There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002.


While the invention of the periodic table of elements is commonly attributed to Dmitri Mendeleev, the atomic weight sorting system was first conceptualized in 1862 by Alexandre-Emile Béguyer de Chancourtois. Despite releasing his table seven years before Mendeleev, Chancourtois' status as a geologis


An element is made of only one kind of atom, while a compound contains the atoms of two or more elements. For example, gold is made of only one kind of atom, so it is an element, but water is a mix of hydrogen and oxygen, so it is a compound.


Group 6 does not have a unique name; it belongs to a larger family known as the transition metals. The transition metals include Groups 3 through 12 on the periodic table. Group 6 contains the elements chromium, molybdenum, tungsten and seaborgium.


About.com and Ptable.com provide periodic tables that include all element names. The website Periodictable.com also provides a periodic table with element names and a number of identifying pictures.


Common table salt, without any of the extra ingredients that may be added to the retail food product, is a compound comprised of the metallic element sodium and the non-metallic element chlorine. The chemical name for pure table salt is sodium chloride, and it is represented by the chemical formula


As of 2015, periodic tables of the elements can be downloaded from Los Alamos National Laboratory, Science Geek and WebElements. All three offer downloads in PDF format.


All organic compounds contain carbon. Carbon is so important to the structure of organic molecules that organic chemistry has been called the study of carbon and its compounds. Other elements are readily incorporated into organic molecules, though the determining feature of an organic molecule is th


The columns on the periodic table of elements are called groups. The elements in a group share the same configuration of valence electrons, which gives the elements similar chemical properties. The number of valence electrons in a group is sometimes represented with a Roman numeral above the column.