Question

Merits of Newland law of octaves ​

Answer 1

Answer:

State Law of Octaves

According to the law of octaves, each eighth element in the periodic table shares likewise physical and chemical properties. Thus, each element in the parallel row must have similar physical and chemical properties. But this is not true. The periodicity is only valid till calcium. An example of the Law of Octaves is lithium, sodium, and potassium; they share physical and chemical properties. Similarly, Mg is the eighth element to be. Hence, both elements share the same physical and chemical properties. The remaining elements after potassium (Cu, Rb, Ag, and a few more) are different. Those elements do not show similarities to the former elements. This is the reason why the law of octaves fails to incorporate transition metals.

Answer 2

The law provided a broad scope to order all known elements into a tabular form. Newlands law of octave was the first to logically based on the atomic weight, i.e., it links the elements' properties to their atomic masses. This system worked quite better for the lighter elements.

Merits:

(i) This classification worked well for lighter elements only up to Ca. (ii) This classification gave us a relation between the properties of the elements and their atomic masses.(iii) It was shown by this classification for the first time that there exists a periodicity in the properties of the elements.

Demerits:

(i) This classification failed when the heavier elements beyond Ca were arranged according to Newland's law of octaves.(ii) At the time of this law, noble gases were unknown. When noble gases were discovered, neon (Ne) between F and Na, and argon (Ar) between Cl and K, it becomes the ninth element and not the eighth which has the similar properties.

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