Question

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

Answer 1

The electronic configuration of any element tells you its valency and valency helps us to find the group in which the element is present.

For example Electronic configuration of Ca = 2,8,8,2

Thus its valency is 2 and therefore it is present in the second group.

The elements in the second group are:
Beryllium
Magnesium
Calcium
Strontium
Barium
Radium


In addition, the number of electron shells tell the period in which the element is present.

As Ca=2,8,8,2
It is present in 4th period.

Answer 2

Explanation:

In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the same.

Elements across a period show an increase in the number of valence electrons.