Question

how does the electronic configuration of an atom related to its position in the modern period table give an example

Answer 1

No of shells of an atom decides it position in modern periodic table.

Answer 2

The electronic configuration of the atoms describes about the electrons in the atom.And it also describes about the group and period of the element in the periodic table.e.g.the electronic configuration of sodium is 3s1 here 3 describes group and 1 describes period.