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Question
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 |
Solution
| 1. | Triads | Dobereiner |
| 2. | Alkali metal | Sodium |
| 3. | Law of octaves | Newlands |
| 4. | Alkaline earth metal | Calcium |
| 5. | Modern Periodic Law | Henry Moseley |
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RELATED QUESTIONS
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What were the limitations of Dobereiner’s classification?
Name the scientist who gave Law of triads in the early classification of elements.
What is Debereiner's law of triads? Explain with the help of one example of a Dobereiner's triad.
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.
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Find the odd one out and give its explanation.
In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.
State Dobereiner’s Law of Triads.
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- Na, Si, Cl
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Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40 Explain by giving reason.
