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Why f-block elements are placed below th...

Why f-block elements are placed below the main table.

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In Lanthanides 4f- orbitals and in Actinides 5f-orbitals are filled. Since these elements have the same electronic configuration in the ultimate and penultimate shells they have similar properties. Hence they were placed at the bottom of the periodic table though they belongs to the sixth and seventh periods of IIIB groups.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Short Answer Questions
  1. How did Mosley's work on atomic number show that atomic number is a fu...

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  2. State modern periodic law. How many groups and periods are present in ...

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  3. Why f-block elements are placed below the main table.

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  4. Mention the number of elements present in each of the periods in the l...

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  5. Give the outer orbit general electronic configutation of (a) Noble g...

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  6. Give any five of the characteristic properties of transition elements.

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  7. What are rare earths and transuranic elements?

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  8. What is isoelectronic series? Name a series that will be isoelectronic...

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  9. What is isoelectronic series? Name a series that will be isoelectronic...

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  10. What is isoelectronic series? Name a series that will be isoelectronic...

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  11. What is isoelectronic series? Name a series that will be isoelectronic...

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  12. Explain why cation is smaller and anion is larger in radii than their ...

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  13. Arrange the second period elements in the increasing order of their fi...

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  14. IE(1) of Na is less than that of Mg but IE(2) of Na is higher than tha...

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  15. What are the various factors due to which the IE of the main group ...

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  16. The first ionization enthalpy values (in kJ mol^(-1)) of group 13 elem...

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  17. Would you expect the second electron gain enthalpy of oxygen as positi...

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  18. What is the basic difference between the electron gain enthalpy and el...

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  19. Would you expect IE(1) for two isotopes of the same element to be the ...

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  20. Increasing order of reactivity among group - 1 elements is Li < Na < K...

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