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<, , <, , Bes, The diagonal relationship within s-block elements, , Group 1 Group 2 Group 13 Group 14, , , , , , Second period, , , , , Third period, , A diagonal relationship in s-block elements exists between adjacent, elements which are located in the second and third period of the, periodic table., , For example, Lithium of group 1 and second period shows, similarities with the properties of magnesium which are located in, the 2nd group and 3rd period., , Similarly, properties of Beryllium which are located in the 2nd group, and 2nd period show a likeness with properties of Aluminium which, is located in the third period and third group., , The two elements which show similarities in their properties can be, called a diagonal pair or diagonal neighbours., , The properties of s-block elements vary significantly when, compared to the other elements of the sub-group they belong to., The diagonal neighbours show a lot of similarities. Such a, relationship is exhibited as you move left to right and down the, group; the periodic table has opposing factors., , For example, the electronegativity of the s-block elements increases, as we go across the period and decreases as we go down the group., Therefore, when it is moved diagonally the opposite tendencies, cancel out and the value of electronegativity almost remains the, same.