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
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.
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.
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.
Table salt is an ionic compound composed of the elements sodium and chlorine, in equal proportions. The chemical symbol for this compound is NaCl, and it is an essential nutrient for human beings and many other animals.
Sodium and chlorine are the two elements that make up table salt. When the two elements are compounded, they make up sodium chloride, which is the scientific name for table salt.
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.
In the modern periodic table, elements are arranged by atomic number. They are placed with the lowest atomic number first, and elements with increasing atomic numbers run to the right. They are also arranged in vertical columns known as groups, with these groupings based on shared properties.