Question

Explain dobereiner's traid rule by giving example​

Answer 1

Answer:Dobereiner law of triads states that the average of the atomic masses of the first and third element in a triad will be roughly equal to the atomic mass of the second element in that triad. He suggested that this law can be extended for other properties of elements like density. ... The atomic mass of barium is 137g/mol.

Explanation:

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Answer 2

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Your required answer :

Dobereiner's Triads :

• In 1817, German chemist Johann Wolfgang Dobereiner was the First man who related the properties of elements to their atomic-mass.

• He classified the known elements in groups of three elements on the basis of similarities in their properties.

• Such groups were called triads.

Triads had the following characteristics :

• Properties of elements in each triad were similar.

• Atomic mass of the middle element was approximately equal to the arithmetic mean of the rest two.

Triads formed by Dobereiner ( Example ) :

• Lithium (Li), Sodium (Na) and Potassium (K) group. This group was called "Alkali metalands group".

• Calcium (Ca), Strontium (Sr) and Barium (Ba) group. This group was called "Alkaline earth metal group"

• Sulphur (S), Selenium (Se) and Tellurium (Te) group.

• Chlorine (CI), Bromine (Br) and Iodine (I) group. "This group was called halogen group."

→→→→→The main drawback of Dobereiner's classification in the form of triads was that he could not be able to prepare triads of all the known elements.

→→→→→ Even then, it was a great achievement in iron. because first time, he tried to have a relationship between properties of elements and their atomic masses.

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