Which law was based on notes of the music?

Law of octaves

The correct answer is option 2. Law of octaves.

The law based on notes of music is Law of octaves.

The Law of Octaves was proposed by the English chemist John Newlands in 1864. He observed that when elements are arranged in order of increasing atomic mass, their properties repeat every eighth element, similar to the repeating pattern of musical notes in an octave. This was the first attempt to classify the elements in a systematic way, preceding Mendeleev's periodic table. However, Newlands' law was criticized for its limitations, particularly its failure to account for the existence of all known elements and its inability to accommodate newly discovered elements. Despite its shortcomings, Newlands' Law of Octaves laid the groundwork for the development of the modern periodic table.