Question

Define newlands law of octave ?Why newton's law is called the law of octaves

Answer 1

Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements

In the year 1866, an English scientist, John Newlands arranged the elements in the order of increasing atomic masses. Till then only 56 elements were known to us. He started with hydrogen which has the lowest atomic mass and finally ended at thorium which was the element known to have highest atomic mass at that time. He noticed that every eighth element exhibits similar properties as compared to the first element. He called this law as the ‘Law of Octaves’ better known as ‘Newland’s Law of Octaves’. According to Newland’s Law of Octaves, as the observed properties of lithium and sodium are same, sodium is placed at the eighth position with respect to lithium. 

Answer 2

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$\large\underline{Newlands\:Law\:of\:Octaves:-}$

✔️ In 1866, he arranged then known elements in order of increasing atomic masses.

✔️ He started with element having low atomic mass,hydrogen and ended up in the thorium which was the 56th element.

✔️ He found that every eight element had properties similar that of the first.

✔️ He compared this to the octaves found in music.

✔️ Therefore, he called it the “Law of Octaves”. It is known as “Newland’s Law of Octaves”.

Example:-

The Properties of Lithium and sodium are similar. Sodium is the eight element after Lithium.

Hope it helps you!!