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प्रश्न
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.
उत्तर
According to Dobereiner's triad, the atomic mass of the second element is nearly equal to the average of the atomic masses of the first and the third elements provided the three elements are arranged in the increasing order of their atomic masses.
Be, Mg, Ca:
Atomic mass of Be - 9, Mg - 24, Ca - 40
Average of atomic masses of Be and Ca = `(9 + 40)/(2) = 24.5` which is nearly equal to the atomic mass of Mg i.e. 24.
Thus, it can be considered as Dobereiner's triad.
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संबंधित प्रश्न
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
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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.
State one example of a Dobereiner's triad, showing in it that the atomic mass of middle element is half-way between those of the other two.
What is Debereiner's law of triads? Explain with the help of one example of a Dobereiner's triad.
With an example, explain Dobereiner's Triads.
Can the following groups of elements be classified as Dobereiner's triad:
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Atomic mass of Na - 23, Si - 28, Cl - 35.
Justify your answer.
State Dobereiner’s Law of Triads with suitable examples.
In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.
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