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Give four defects of Mendeleev's periodi...

Give four defects of Mendeleev's periodic table.

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(i) Isotopes should be given separate place because they have different atomic mass and character(ii) The increasing order of atomic weight is not maintained . (iii) Some elements in the same group differ in their properties . (iv) The position of hydrogen is not justified .
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SUBHASH PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -TWO marks questions and answers
  1. What are s,p,d and f block elements ?

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  2. Give four characteristics of s-block elements.

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  3. Give four defects of Mendeleev's periodic table.

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  4. Give two reason , why the number of elements in first period is only 2...

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  5. On the basis of their electronic configurations, explain why alkali m...

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  6. Give the order in which the melting points of halides of sodium decrea...

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  7. Why are group I elements called alkali metals and group 17 are called ...

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  8. Give four characteristics of d-block elements.

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  9. Give any two features of Mendeleev's periodic table.

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  10. How does the solubility of a solute vary with increase in temperature ...

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  11. Why is melting point of LiCl lower than NaCl ?

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  12. Arrange the following in increasing order : BeCO(3),BaCO(3),CaCO(3),...

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  13. Arrange the following in increasing order : BeCl(2),BaCl(2),SrCl(2),...

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  14. Which alkali metal carbonate is thermally unstable and why ?

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  15. Out of O and S which has higher negative electron gain enthalpy and wh...

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  16. Predict which atom in each of the following Period has the highest fir...

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  17. Among the elements Li, K,Ca, S and Kr , which one is expected to have ...

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  18. Among the elements of the third period Na to Ar pick out the element: ...

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  19. Among the elements of the third period Na to Ar pick out the element: ...

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  20. Among the elements of the third period Na to Ar pick out the element: ...

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