Question 1 - Past Year - 2 Mark Questions - Chapter 5 Class 10 - Periodic Classification of Elements

How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?

Answer

Electronic configuration of atoms can be found out by

• Number of valence electrons
• Number of shells

The modern periodic table consists of horizontal rows called periods and vertical columns called groups .

• The number of valence electrons (i.e. the number of electrons present in the outermost shell) decides the group number of an element.
• The number of shells determines the period of an element.