Question
Tue February 26, 2013 By: Vinny

what are 'p','s' and 'd' block elements?

Expert Reply
Tue February 26, 2013

The modern periodic table is divided into four main blocks – s -block, p-block, d-block and f-block depending on the type of orbital that are being filled with exception of hydrogen and helium.

  1. The elements in which last electron enter the s-orbital of their outermost energy level are called s-block elements. The s-block consists of two groups, Group-1 and Group-2.
  2. The elements of Group-1 are called alkali metals and have ns1 as the general outer electronic configuration. The elements of Group-2 are called alkaline earth metals and have ns2 as the general outer electronic configuration.
  3. The elements in which last electron enter the p-orbital of their outermost energy level are called p-block elements. The p-block elements constitute elements belonging to group 13 to 18.
  4. The outermost electronic configuration of p-block elements varies from ns2np1 to ns2np6
  5. Elements in which the last electron enters d-orbitals of penultimate energy level constitute d-block elements. Elements of group 3 to 12 in the centre of periodic table constitute the d-block elements
  6. General outer electronic configuration of d-block elements is (n-1)d1-10 ns1-2
  7.  Elements in which last electron enters f-orbitals are called f-block elements.

 

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