Correct Answer: Law of octaves

Solution : The correct option is the Law of octaves .

The "Law of Octaves" in the context of chemistry was a concept that drew an analogy to the musical scale. In the Law of Octaves, Mendeleev noted that when elements were arranged by increasing atomic mass, every eighth element had similar properties to the first, creating a pattern for the eight notes in a musical octave. This arrangement eventually laid the groundwork for the modern periodic table of elements.