The property of every eighth element is similar to that of the first given by ________.

In the year 1864, the British chemist John Newlands attempted the 62 elements known at that time. He arranged them in an ascending order based on their atomic masses and observed that every 8th element had similar properties. 
On the basis of this observation, the Newlands law of octaves was formulated.
The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses.