Based on which factor are the elements classified into four blocks?

The elements are classified into four blocks depending on the type of orbital being filled, i.e., s, p, d and f blocks.

  • Based on the composition of electron orbitals, hydrogen, helium and Group 1 elements are classified as s-block elements, Group 13 through Group 18 elements p-block elements, Group 3 through Group 12 elements d-block elements, and lanthanoid and actinoid elements f-block elements.
  • S-Block, p-block, and Group 12 elements are called main group elements, and d-block elements other than Group 12 and f-block elements are called transition elements.
  • The d-block elements are called transition elements because they exhibit transitional behaviour between s-block and p-block elements.

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