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Write and study the achivements and drawbacks of scientist doberianer

Posted by Muskan Singh 5 years, 8 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 8 months ago

Drawback of Dobereiner's triads:

Dobereiner could identify only three triads. He was not able to prepare triads of all the known elements
All the known elements could not be arranged in the form of triads.
For very low mass or for very high mass elements, the law was not holding good. Take the example of F, Cl, Br. Atomic mass of Cl is not an arithmetic mean of atomic masses of F and Br.

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Meghna Thapar 5 years, 8 months ago

Law of Triads:

When elements are arranged in the order of their increasing atomic masses, the atomic mass of the middle element was approximately the mean of the atomic masses of the other two elements.

For example: Consider the triad of lithium, sodium and potassium. The atomic mass of sodium is the mean of the atomic masses of lithium and potassium.

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