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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
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
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.
A, B and C are the elements of a Dobereiner's triad. If the atomic mass of A is 7 and the of C is 39, what should be the atomic mass of B?
What is Debereiner's law of triads? Explain with the help of one example of a Dobereiner's triad.
Can the following groups of elements be classified as Dobereiner's triads?
(a) Na, Si, Cl
(b) Be, Mg, Ca
Give reason for your answer.
(Atomic masses : Be 9 ; Na 23 ; Mg 24 ; Si 28 ; Cl 35.5 ; Ca 40)
In Dobereiner’s triads Li, Na, K, the atomic masses of Lithium and Potassium are 6.9 and 39.1 respectively, then what will be the atomic mass of sodium?
Can the following groups of elements be classified as Dobereiner's triad:
Na, Si, Cl
Atomic mass of Na - 23, Si - 28, Cl - 35.
Justify your answer.
Dobereiner laid down the _______ rule.
Find the odd one out and give its explanation.
If Dobereiner is related with ‘law of triads’, then Newlands is related with ______.
