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Write two achievements of Mendeleev's pe...

Write two achievements of Mendeleev's periodic table.

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Achievements of Mendeleev.s Periodic Law :
(i) It could classify all the elements discovered at that time.
(ii) It helped in discovery of new elements.
(iii) It helped in correction of atomic mass of some of the elements.
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SWAN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -ADDITIONAL IMPORTANT QUESTIONS (Short Answer Type Questions)
  1. Write two achievements of Mendeleev's periodic table.

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  2. Nitrogen(atomic number 7 ) and phosphorus (atomic number 15) belong to...

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  3. Why group 17 elements form Uninegative Anions ?

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  4. Give reasons for the following: Lithium atom is smaller than sodium...

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  5. Give reasons for the following: Chlorine (atomic number 17) is more ...

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  6. How does the reactivity of the metals vary in a group?

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  7. The elements Li, Na and K, each having one valence electron, are in pe...

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  8. The elements Li, Na and K, each having one valence electron, are in pe...

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  9. The elements Li, Na and K, each having one valence electron, are in pe...

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  10. Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 resp...

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  11. Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 resp...

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  12. Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 resp...

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  13. The element Be, Mg, Ca are placed in the second group of the periodic ...

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  14. The element Be, Mg, Ca are placed in the second group of the periodic ...

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  15. The element Be, Mg, Ca are placed in the second group of the periodic ...

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  16. Table given below shows a part of the periodic table: Using this ...

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  17. Table given below shows a part of the periodic table: Using this ...

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  18. Table given below shows a part of the periodic table: Using this ...

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  19. Explain the following term- Sericulture

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  20. Two elements X and Y belong to group 1 and 2 - respectively in the sam...

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