Class 11 Chemistry The S Block Elements Diagonal Relationship

Diagonal Relationship

  • The similarity in the properties of definite pairs of diagonally adjacent elements in the second and third periods of the periodic table is called diagonal relationship.
  • In s-block elements Lithium is the first element of group 1 whereas Beryllium is the first elementsof Group 2.
  • Some of their properties do not match with the properties exhibited by other elements of their group.
  • Instead their properties resemble the properties of the second element of the following group due to the similarity in ionic sizes and /orcharge/radius ratio of the elements.
  • Consequently lithium and magnesium have similar properties whereas Beryllium and Aluminium exhibit similar properties.
  • This relation is called diagonal relationship.

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