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प्रश्न
Explain why Dobereiner’s method of classification of elements did not hold much weightage for future classification.
उत्तर
Reasons for discarding the law of triads:
- Only three triads could be formed and was not holding for other elements.
- The law was not applicable even in the same family.
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संबंधित प्रश्न
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.
Name the scientist who gave Law of triads in the early classification of elements.
What were the limitations of Dobereiner's classification of elements?
The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively.
(a) Calculate the average atomic mass of elements X and Z.
(b) How does the average atomic mass of elements X and Z compare with the atomic mass of element Y?
(c) Which law of classification of elements is illustrated by this example?
(d) What could the elements X, Y and Z be?
(e) Give another example of a set of elements which can be classified according to this law.
Can the following groups of elements be classified as Dobereiner's triad:
Be, Mg, Ca
Atomic mass of Be - 9, Mg - 24, Ca - 40.
Justify your answer.
What was Dobereiner’s basis, of classification of elements?
Find the odd one out and give its explanation.
According to Dobereiner’s triads rule, three elements in an increasing order of atomic mass shows _______.
In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.
State Dobereiner’s Law of Triads.
