Elements have been arranged in the following sequence according to the Newlands’ Law of Octaves, as shown below. Which of the elements given below will show similar properties?

F, Na, Mg, Al, Si, P, S, Cl, K

Elements need to be classified and organized into groups of elements with similar properties. For example, Newlands’ law of octaves states that the property of every eighth element is similar when elements are arranged according to the increasing order of their atomic masses.

Hence, Sodium and potassium will have similar properties, and fluorine (F) and chlorine (Cl) will have similar properties.