How does the electronic configuration of an atom relate to its position in the modern periodic table ?

How does the electronic configuration of an atom relate to its positio

1.	How does the electronic configuration of an atom relate to its position in the modern periodic table ?
Answer» Solution :In the periodic table, POSITION of an element depends on its ELECTRONIC CONFIGURATION. The position of an element can be determined by knowing the number of valence electron in its electronic configuration. For example, `""_(11)Na:underset(2)K""underset(8)L""underset(1)M:Na` possesses one electron in its valence SHELL. Hence, it BELONGS to group 1. The number of shells in the electronic configuration of an element determines its position in a period. For example, `""_(11)Na:underset(2)K""underset(8)L""underset(1)M:Na` has three shells(K, L and M). So, it belongs to 3rd period of the periodic table.