How does the electronic configuration of an atom of an element related to its position in the modern periodic table ? Explain with one example.

Explanation

"Properties of clements are the periodic fiunction of their atomic number
The position of elements depend upon number of valence electrons which depend upon clectronic configuration those clements wich have same valenee elcctrons occupy same group. Those elements which have one vaience electrons belong to group I elements, which have two valence clectrons belong to group 2. Period numbers is cqual to the number of shell. Example atonic number of sodium (Na) is 1, so electronic conf+guration will be 2.8,1. Sodium has one valence electron in vaience shell so it belong to group1 as sodium has three shells, so it belong to 3rd period.