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Dobereiner's Triads

Dobereiner wa...

Question

Dobereiner was the first person to illustrate the relationship between the ____________ of elements and their properties.

A

atomic masses

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B

electron negativity

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C

molecular masses

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D

number of protons

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Solution

The correct option is A atomic masses
Dobereiner grouped elements in sets of triads. Each group had 3 elements. He illustrated the relationship between the atomic masses of elements and their properties with his law of triads.

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Q. Given below are the elements with their atomic masses. Identify a set of elements which is not a Dobereiner triad.

Q. Given below are the elements with their atomic masses. Identify a set of elements which is not a Dobereiner Triad?

Q. When a Dobereiner triad is considered, the sum of atomic weights of extreme elements X and Z is 177.6 and difference of Z and Y is five times the number of protons present in a neon atom. Identify X, Y and Z.

Q. Why Dobereiner, Newlands and Mendeleeff were not 100% successful in their classification of elements ? Why the modern table is relatively a better classification ? Predict the reason.

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