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The three elements A, B and C with simil...

The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. This mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as ? Give on example of such a set of elements.

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The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. The arrangement of these elements is known as Dobereiner triad.
Example : Lithium, Sodium, and Potassium.
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OSWAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -NCERT EXEMPLAR (SHORT ANSWER QUESTIONS)
  1. The three elements A, B and C with similar properties have atomic mass...

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  2. Elements have been arranged in the following sequence on the basis of ...

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  3. Elements have been arranged in the following sequence on the basis of ...

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  4. Can the following groups of elements be classified as Dobereiner' s tr...

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  5. Can the following groups of elements be classified as Dobereiner' s tr...

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  6. In Mendeleev's periodic table, the elements were arranged in the incre...

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  7. Hydrogen occupies a unique position in modern periodic table. Justify ...

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  8. Write the formulae of chlorides of Eka-Silicon and Eka-aluminium, the ...

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  9. Three elements A, B and C have 3,4 and 2 electrons respectively in the...

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  10. If an element X is placed in group 14, what will be the formula and th...

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  11. Compare the radii of two species X and Y. Give reasons for your answer...

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  12. Arrange the following elements in increasing order of their atomic rad...

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  13. Arrange the following elements in increasing order of their atomic rad...

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  14. Identify and name the metals whose electronic configuration is given...

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  15. Identify and name the metal whose electronic configuration are given b...

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  16. Identify and name the element whose electronic configuration are given...

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  17. Identify and name the metal whose electronic configuration is given b...

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  18. Write the formula of the product formed when the element A (atomic num...

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  19. Arrange the following elements in the increasing order of their metall...

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  20. Identify, the elements with the following property . An element whic...

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