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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.
Sometimes, it is also regarded as the basis of Modern Periodic Table. In a period, the number of valence electrons increases (mostly for light metal / elements) as we move from left to right side. However, in a group this periodic trend is constant, that is the number of valence electrons remains the same.hese periodic trends are distributed among 3 different properties namely, physical properties, chemical properties and on the basis of chemical reactivity.