Question

the discovery of ---------- rejected law of octave..
A. Halogens
B. Inert gases
C. Alkali Metals
D. Heavy metals

Answer 1

The Law of Octaves was published by John Newland in 1864. He proposed that some of the physical and chemical properties of the elements must be repeated after every seven elements - so called octave. However, inert gases were not known at that time. Thus, their existence is one of the fact, which make the Law of Octaves to be a very limited rule.

The answer is B.