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Cobalt is a hard silvery gray metal. In the periodic table of chemical elements there is a group also known as a family is a column of elements. Groups Periods A Group Is A Column On The Periodic Table The periodic table also known as the periodic table of elements is a tabular display of the chemical elements which are arranged by atomic number electron configuration and recurring chemical properties. Periodic table of elements groups . The columns of the table represent groups or families of elements. There are also more specific groups like alkali metals transition metals rare metals alkaline earth halogens and noble gases. Note that the periodic table of elements page is provided in order to help navigate abundant chemical element data available in pubchem each element also has a dedicated page with a lot more information available about each element including references. This is a sample of pure chlorine gas. It is organized in order of increasing atomic number. The e