Question

characteristics of dobereiner's triads​

Answer 1

Answer:

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Answer 2

Answer:

In a Dobernier's triad, three elements are placed together and stated as the "triad" . In a triad, the average of the atomic masses of the first and the third element is roughly equal to the atomic mass of the second or middle element. For example,

i.) Lithium , Sodium and Potassium

The atomic mass of Li is 6.9 and that of K is 39.1 . The atomic mass of the middle element Na is 23. The average of the atomic masses of Li and K is (6.9 + 39.1)/2 = 23.0. Now we can see that the average of the first and third element's atomic mass is equal to the atomic mass of the middle element.

Some other examples of Dobernier's triad are -

ii.) Calcium, Strontium, Barium

iii.) Chlorine,Bromine,Iodine

iv.) Sulphur,Selenium,Tellurium.

v.) Carbon, Nitrogen,Oxygen

vi.) Iron, Cobalt, Nickel

But this process of grouping elements was discarded because all elements could not be arranged in this way.

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