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Periodic Classifications of Elements
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
In the Modern Periodic Table, the elements are arranged in increasing order of their atomic number. The atomic number is directly related to the electronic configuration of an atom. One can locate the position of an element in the periodic table based on its electronic configuration. The number of valance electrons gives information of Group while the number of the electronic shell gives the information of Period. For example, the electronic configuration of lithium is (2,1). It has one valance electron, so it belongs to Group 1. Similarly, it has two electronic shells, so it belongs to Period 2. Sodium has one valance electron (2,8,1). So, it will belong to Group 1 and Period 3 (as it has three electronic shells).
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