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What are Lanthanoid and actinoids. Gi...

What are Lanthanoid and actinoids.
Give their positions in modern periodic table.

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CBSE COMPLEMENTARY MATERIAL-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -3 - MARKS QUESTIONS
  1. What are representative elements, Give their positions in modern per...

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  2. What are Transition elements, Give their positions in modern period...

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  3. What are Lanthanoid and actinoids. Give their positions in modern p...

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  4. Why LiF, NaF, KF, RbF, CsF are ionic ? But LiF is less ionic than CsF.

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  5. Why Ca has larger atomic radius than Al ?

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  6. Why 2s^2 electron is difficult to remove than 2p electron ?

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  7. Why the compounds of group 17 with group 13 elements are more ionic ...

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  8. Explain the following data : Ionisation energy Cl lt H lt O lt N lt...

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  9. IE2 of 3^(rd) period elements is as follows. Why ? Mg lt Si lt Al ...

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  10. Account fot the following: Halogens have very high negative electron...

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  11. Account fot the following: The electron gain enthalpy of Cl (Z = 17 ...

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  12. The ionisation energy of nitrogen is more than that of oxygen because

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  13. What are the d- block elements? Write any four properties of d - block...

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  14. State Modern periodic law.

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  15. Explain the following: Electro-negativity

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  16. Explain the following: Shielding effect

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  17. Among the second period elements the actual ionisation enthalpies are ...

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  18. Among the second period elements the actual ionisation enthalpies are ...

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  19. What do you understand by the isoelectronic species ? Name a species t...

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  20. What do you understand by the isoelectronic species ? Name a species t...

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