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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.
Unlike today's table Mendeleev's table lacks certain elements and was arranged according to atomic weight. With improvements from scientists in the 19th and 20th century, new elements were introduced and new rows were added. In the course of overall 100 years the modern periodic table was created. ï»¿ ï»¿ ï»¿