Question

What was the main reason for the rejection of Newlands law of octaves?

Answer 1

1 This classification was good with a few elements only, and was not applicable to all elements. It was not valid for elements having atomic masses higher than Ca.
After the discovery of Nobel gases, it became difficult to fit them in Newland’s periodic table.
2 Newland’s octave law gave a very important term of periodicity which was repeated in further classifications.
3. His classification was based on the concept that the atomic mass of an element is the periodic function of it's chemical and physical properties.
4. The same concept of periodicity of elements was repeated in Moseley’s classification and the latest long form of periodic table is also based on the same concept. The only change is the use of atomic number instead of atomic mass.
5 Newland’s octave law was good till 1913. But in 1913 Henry Moseley established a new concept that the properties of elements varied periodically according to atomic number, not atomic weight.

Answer 2

same