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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 can be classified into metals, nonmetals and metalloids. The characteristics of these groups vary greatly. Metals tend to be ductile, malleable, have a metallic luster and are conductors of heat and electricity. Nonmetals tend to be non-lustrous, brittle and poor conductors of heat and electricity. Ductile means that an element has the ability to be drawn into a wire. Copper is used in wiring because it is both ductile and conductive. Malleable means that an element has the ability to be hammered into thin sheets while luster means the element is shiny.