Question

illustrate newlands law of octaves with suitable example​

Answer 1

Answer:

In 1866,John Newlands , an English scientist, arranged the then known elements in the order of increasing atomic masses.

He started with hydrogen ,the element having the lowest atomic masses and ended at thorium which was the 56th element.

Newlands found that every eighth element had properties similar to the properties of the first element .

Newlands observe this analogy with the octaves found in musical scale and proposed the law of octaves.

Law of octaves : When elements are arranged in order of their increasing atomic masses, then the properties of every eighth element are similar to the properties of the first element.

Answer 2

Answer:

Newlands' law of octaves is law related to classification of elements given by Newlands.

Explanation:

1. Newlands arranged the elements known at that time in an increasing order of their atomic masses.

2. This law says that,

When the elements are arranged in an increasing order of their atomic masses, every eighth element shows the similar properties to that of the first element.

3. Newlands arranged only a few elements known at that time.

4. In those elements, the law was applicable.

5. Illustration of Newlands' law of octaves:

If the first 21 elements known at that time ( except inert gases ) are arranged in an increasing order of their atomic masses, we can get the octave as shown below:

$\begin{array}{|c|c|c|c|c|c|c|}\cline{1-7}\sf\:H & \sf\:Li & \sf\:Be & \sf\:B & \sf\:C & \sf\:N & \sf\:O\\\cline{1-7}\sf\:F & \sf\:Na & \sf\:Mg & \sf\:Al & \sf\:Si & \sf\:P & \sf\:S\\\cline{1-7}\sf\:Cl & \sf\:K & \sf\:Ca & \sf\:Cr & \sf\:Ti & \sf\:Mn & \sf\:Fe\\\cline{1-7}\end{array}$

6. If we observe this table ( octave ), we find that Na is the eighth element from Li.

7. Both Na ( sodium ) & Li ( lithium ) have similar properties.

8. Also the elements like C & Si, Na & K, Mg & Ca, F & Cl show similar properties.

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