Mention the defects of Newlands’ Law of Octaves.
Answers
Answer:
Newland could arrange elements only up to calcium, out of the total 56 elements known.
After calcium, every eighth element did not possess properties similar to that of the first.
Only 56 elements were known at the time of Newlands, but later several elements were discovered.
In order to fit the existing element arrangement, Newlands placed two elements in the same position which differed in their properties.
For example Iron, an element which resembles cobalt and nickel in its properties is placed far away from these elements.
The periodic table did not include inert gases because they were not discovered then.
Answer:
Defects of Law of Octaves• This law could be best applied only up to the element calcium. Newly discovered elements could not fit into the octave structure. The feature of resemblance of the 8th element when arranged in increasing order of their atomic mass was not successful with heavier elements.