Periodic Anomalies

In this paper, the electronic arrangement of the elements in the d block, instability of the highest valence state of the nonmetals in the fourth period, inert pair effect, similarity and secondary periodicity of the fifth and sixth periodic heavy transition elements, and periodic anomalies of the arrangement of Group III elements are introduced in detail with necessary discussions. However, the well-known uncertainty about the position of hydrogen in the periodic table and the particularity of elemental properties of the second period are not within the scope of this article.