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State the drawback of Dobereiner's triad...

State the drawback of Dobereiner's triads:

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Drawback of Dobereiner's triads:
All the known elements could not be classified into triads.
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The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39 respectively. a. Calculate the average atomic mass of element B according to Dobereiner's triads. b. Compare the average atomic mass of B with its atomic mass. c. What could the elements A, B and C be?

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TARGET PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -Answer the following
  1. Explain Dobereiner's triads giving one example.

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  2. In Dobereiner's triads Li, Na, K, the atomic masses of lithium and pot...

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  3. State the drawback of Dobereiner's triads:

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  4. Chlorine, bromine and iodine form a Dobereiner's triad . Chlorine has ...

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  5. State the laws/ Define Newlands's Law of octaves:

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  6. Explain Newlands' octaves.

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  7. What were the demerits of Newlands' octaves?

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  8. What is Mendeleev's Periodic law?

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  9. Write a short note on: Mendeleev's periodic law

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  10. State the merits of Mendeleev's periodic table.

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  11. What are the demerits of Mendeleev's periodic table?

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  12. What is the difference between Mendeleev's periodic law and modern per...

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  13. State modern periodic law.

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  14. Write a short note on: Structure of the Modern periodic table

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  15. Give four examples of each of the following: i. Nonmetals

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  16. Give four examples of each of the following: s-Block elements

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  17. Give four examples of each of the following: Alkali metals (or group...

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  18. Give four examples of each of the following: Alkaline earth metals (...

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  19. Give four examples of each of the following: p-Block elements

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  20. Give four examples of each of the following: d-block elements

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