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The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized.
The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.WebElements welcomes four new elements to the periodic table: element 113, nihonium (Nh); element 115, moscovium, Mc; element 117, tennessine, Ts; and 118, oganesson, Og.