Question

Explain newland law of Octave.

Answer 1

Answer:

• The attempt of Doberneir encouraged other chemist to correlate the properties of elements with atomic mass.

• In 1866, John newland and English scientist arranged the then known elements in the order of increasing atomic.

• He started with the element having the lowest atomic mass and ended with Thorium which was the 56th element.

• He found that every eight element had properties similar to that of first element.

• He compare this to the updates found in music therefore it is called law of octaves.

• In Newland's octave the properties of lithium and sodium were found to be same. Sodium is the eighth element after Lithium. Similarly beryllium and magnesium resemble each other.

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Answer 2

Newlands' law of octaves i.e. applicable to only the first few elements i.e., only up to calcium out of total 56 elements known at that time.

Newlands placed two elements each in some boxes to accomodate all known elements e.g. Co and Ni, Ce and La. He placed some elements with different properties under the same note in the octave. For example, Co and Ni away from them along with halogens, while Fe having similarity with Co and Ni away from them along with the nonmetals O and S under the note Ti.

Newlands' octave did not have provision to accomodate the newly discovered elements.