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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
What were the limitations of Dobereiner’s classification?
The arrangement of elements in a group of three is known as ________.
Name the scientist who gave Law of triads in the early classification of elements.
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 were the limitations of Dobereiner's classification of elements?
Did Dobereiners triads also exist in the columns of Newland's Octaves? Compare and find out.
What was Dobereiner’s basis, of classification of elements?
Write the characteristic of Dobereiner’s triads?
In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.
Match the following.
| 1. | Triads | Newlands |
| 2. | Alkali metal | Calcium |
| 3. | Law of octaves | Henry Moseley |
| 4. | Alkaline earth metal | Sodium |
| 5. | Modern Periodic Law | Dobereiner |
