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Which of the following pairs of elements...

Which of the following pairs of elements were found anomalous in Mendeleev's periodic table and why ?
Ar and K
Fe and Co
Co and Ni

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-REVIEW EXERCISES
  1. On what basis did Mendeleev classify the elements ?

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  2. Which of the following pairs of elements were found anomalous in Mende...

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  3. Which of the following pairs of elements were found anomalous in Mende...

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  4. Which of the following pairs of elements were found anomalous in Mende...

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  5. Why was the basis of classification of elements changed from atomic ma...

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  6. In what manner is the long form of periodic table better than Mendele...

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  7. Write the electronic configuration of the following elements and predi...

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  8. Write the electronic configuration of the following elements and predi...

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  9. Write the electronic configuration of the following elements and predi...

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  10. Write the electronic configuration of the following elements and predi...

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  11. Write the electronic configuration of the following elements and predi...

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  12. Classify the following elements into the types and the blocks to which...

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  13. Which of the following radii of an atom is the smallest and why? Cov...

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  14. Which of the following pairs are isoelectronic ? Na, Mg

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  15. Which of the following pairs are isoelectronic ? F^(-),O^(2-)

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  16. Which of the following pairs are isoelectronic ? K^(+),Sc^(3+)

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  17. The ionisation energy of H is 1312 kJ mol^(- 1). How much energy is re...

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  18. It requires 2.378xx10^(7)J energy to ionise a certain amount of helium...

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  19. Which element in each of the following pairs would you expect to have ...

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  20. Which element in each of the following pairs would you expect to have ...

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