The Law of Octaves was proposed by John Alexander Newlands.
Newland’s Law of Octaves
In the year 1864, the British chemist John Newlands attempted the 62 elements known at that time. He ordered them in ascending order based on their atomic masses and discovered that the properties of every eighth element were the same. Newland’s law of octaves was formulated as a result of this discovery.
When the elements are arranged in increasing order of their atomic masses, the law of octaves states that every eighth element has similar properties.