The Octave rule of periodic table Md. Saifur Rahman If the elements are arranged according to their atomic mass then characteristic similarities can be seen in every eighth element.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?