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\tThe 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.\tIn s-block elements Lithium is the first element of group 1 whereas Beryllium is the first elementsof Group 2.\tSome of their properties do not match with the properties exhibited by other elements of their group.\tInstead 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.\tConsequently lithium and magnesium have similar properties whereas Beryllium and Aluminium exhibit similar properties.