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What is lanthanide contraction? Give one...

What is lanthanide contraction? Give one of its consequences.

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Important Questions
  1. Radii of iron atom and its ions follow Fe > Fe^(2+) > Fe^(3+) - explai...

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  2. IE(2) > IE(1) for a given element - why?

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  3. What is lanthanide contraction? Give one of its consequences.

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  4. Select in each pair, the one having lower ionization energy and explai...

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  5. IE(1) of O < IE(1) of N but IE(2) of O > IE(2) of N - Explain.

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  6. Na^(+) has higher value of ionization energy than Ne, though both have...

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  7. Electron affinity of chlorine is more than that of fluorine explain.

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  8. Arrange the following in order of increasing ionic radius : (a) Cl^(...

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  9. Arrange the following in order of increasing ionic radius : (b) Al^(...

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  10. Arrange the following in order of increasing ionic radius : (c ) Na^...

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  11. Mg^(+2) is smaller than O^(-2) in size, though both have same electron...

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  12. Name the element with highest ionization enthalpy.

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  13. Name the family with highest value of ionization enthalpy.

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  14. Which element possesses highest electron affinity?

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  15. Name unknown elements at the time of Mendeleef.

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  16. Name any two typical elements.

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  17. On the basis of quantum numbers, justify that the 6^(th) period of the...

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

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

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  20. What are rare earths and transuranic elements?

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