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In Dobereiner's triads Li, Na, K, the at...

In Dobereiner's triads Li, Na, K, the atomic masses of lithium and potassium are 6.9 and 39.1 respectively, then what will be the atomic mass of sodium?

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Atomic mass of sodium` = (6.9+39.1)/(2)=23`.
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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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