What is the contribution of Dobereiner?

Question

Answer

¶¶ Dobereiner arranged the element in increasing order of atomic masses. He found that the atomic mass of the middle element was approximately equal to the arithmetic mean (average) of the atomic masses of the other two elements of that triad when they are arranged in their increasing order of atomic mass,
e.g., Li, Na, K.

¶¶ The atomic mass of Li is 9 and K is 39. The average of two atomic number is 23 that is the atomic number of sodium.

Answer

Dobereiner

discovered that the relative atomic mass of the middle element in each triad was close to the average of the relative atomic masses of the other two elements. This gave other scientists a clue that relative atomic masses were important when arranging the elements.

Answer

Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad.... He also suggested that this law could be extended for other quantifiable properties of elements... such as density.

Answer

First of all he just contributed that.... some certain groups of three similar elements are called triads...
The elements of a triad had similar properties when arranged in order of increasing atomic masses, the atomic mass and properties of the middle element was roughly the arithmetic mean...

Answer

Dobereiner is the first one to contribute in the evolution of the periodic table. He arranged the then known elements of the periodic table as a group of three elements and he called this group as traids. He arranged the elements in such a way that the average of the masses of the first and third element will be equal to the atomic mass of the middle one.
for e.g.,
lithium,sodium and potassium.
atomic mass of lithium+mass of potassium/2 = 22
i.e.,6+38/2=22 .
and the atomic mass of sodium is 22.

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