Periodic Classification of Elements Class 10 Notes

What is Periodic Classification of Elements?

The tabular arrangement of the chemical elements, ordered according to their atomic number, electron configuration, recurring chemical properties is termed as the periodic classification of elements.

Dmitri Ivanovich Mendeléev, a Russian chemist, was a success in arranging the elements. Hence it is referred to as the Mendeléev’s Periodic Table.

Modern Periodic Table

In the modern periodic table all the elements are arranged into rows and columns based on their increasing atomic number, and other periodic trends including electron configuration, recurring physical and chemical properties. s,p,d, and f are four different blocks of the periodic table. Elements are grouped into these blocks mainly based on the subshell in which the last electrons is being filled up.

  • The long form of the periodic table consists of 18 vertical columns, called groups, which are numbered from 1 to 18.
  • The first two groups of the periodic table are called as called as the s- block elements and the elements of these two groups are Alkali metals and Alkaline earth metals.
  • The elements placed in group 3 to group 12 are called the d-block elements and its consists of transition metals.
  • The elements placed in group 13 to group 18 are called the p-block elements and its consists of metals, metalloids, noble gases, and halogens.
  • The lanthanides and actinides, which are also called the inner transition elements are grouped separately at the bottom of the periodic table and are called as the f- block elements.

Few Important Questions

  • What is Ionization Energy?
  • What are Lanthanides and Actinides?
  • Define Electron affinity and Electronegativity.
  • What is the trend in atomic radii across a period?
  • Which groups of the modern periodic table contains metals and metalloids?

Learn more about Periodic classification of elements from the topics given below:

Practise This Question

Select the option that will complete the homologous series given below.

C2H4, C3H6, _______, C5H10, C6H12