Question

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

Answer 1

Modern periodic law states that the physical and chemical properties of elements are periodic functions of their electronic configuration.
hence by electronic configuration we can identify which period and group an element belongs to it.
for example: Magnesium - atomic number 12
electronic configuration is 1s2 2s2 2p6 3s2.
so it is s block element.
group number - no of valence electrons- 2
period number - maximum principal quantum- 3
so Magnesium position is 3 Rd period and group second

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.