state dobereiners law of trieds giving one example
Answers
Answer:
In the year 1817, Johann Wolfgang Döbereiner, a German chemist; has made an attempt to arrange the elements with similar properties into groups having three elements each. He called these groups as traids. Döbereiner showed that when the three elements in a triad were arranged in order of increasing atomic masses, the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.
e.g.
element Li Na K
Atomic mass 7 23 39
Average atomic (7+39)/2 = 23
Importance
The given classification of elements into traids had a significance in predicting atomic mass and properties of middle element. Even in these days, these elements resemble in their properties.
Limitation
All the elements discovered at that time could not be classified into traids. Döbereiner could identify only three triads from the elements known at that time.
These are:
Li, Na, K
Ca, Sr Ba
Cl, Br, I
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