Question

(a)Explain the ‘Newlands’ Law of octaves.

(b)Why was the law discarded?

Answer 1

(a) Newland's law of octaves

• Elements when arrange in increasing order of their atomic mass then the physical and chemical properties of element 1st resemble with properties of the 8th element.
• For example, The 8th element of lithium is sodium and resembles it in physical and chemical properties, and the 8th element of magnesium(Mg) resembles Calcium(Ca).

(b) Limitation of Newland's law of octaves

The law of octaves was discarded because of the following reasons:

• This law was not applicable to heavier elements.
• Newland placed cobalt(Co), and nickel(Ni) in the same slot although they are not resembling in properties.
• Ferus(Fe), which resembles cobalt(Co) and Nickel(Ni) placed apart.
• Newland octaves rule was not applicable after calcium(Ca).