न्यूलैंड का अष्टक नियम क्या है and its limirations
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Thus, Newlands suggested that when the elements are arranged in the order of increasing atomic masses, the properties of every eight element are a repetition of that of the first element.
Limitations of law of octaves: The law of octaves has the following limitations ;
(A) The law of octaves was found to be applicable only upto calcium. It was not applicable to elements of higher atomic masses.
(B) Position of hydrogen along with fluorine and chlorine was not justified on the basis of chemical properties.
(C) Newlands placed two elements in the same slot to fit elements in the table. He also placed some unlike elements under the same slot. For example, cobalt and nickel are placed in the same slot and in the column of fluorine, chlorine and bromine. But cobalt and nickel have properties quite different from fluorine, chlorine and bromine. Similarly, iron which has resemblances with cobalt and nickel in its properties has been placed for away from these elements.
Thus, it was realized that Newlands’ law of octaves worked well only with lighter elements. Therefore, this classification was rejected.