Home
Class 12
CHEMISTRY
Account for the following : (a) Europl...

Account for the following `:`
(a) Europlum (II) is more stable than cerium (II).
(b) Transition metal have high enthalpies of atomisation . (c ) Actinoid ions are generally coloured.

Text Solution

Verified by Experts

(a) Europlum has stable electronic configuration , i.e.,`[Xe] 4f^(7) 5d^(0)6s^(0)`.
(b) Due to large number of unpaired electrons in their atom, there is larger and stronger metallic bonding.
(c ) Unpaired electron are present in their ions whcih undergo f-f transition.
Promotional Banner

Topper's Solved these Questions

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise NCERT (QUESTIONS AND EXERCISES WITH ANSERS)|10 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise NCERT INTEXT UNSOLVED QUESTIONS|10 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise TEST YOUR GRIP( FILL IN THE BLANKS)|33 Videos

  • CORDINATION COMPOUNDS

    PRADEEP|Exercise Important Questions|28 Videos

  • ELECTROCHEMISTRY

    PRADEEP|Exercise IMPORTANT QUESTIONS FOR BOARD EXAMINATION|25 Videos

Similar Questions

Explore conceptually related problems

Why is europium (II) more stable than cerium (II) ?

In which of the following pairs II is more stable than I

Assing the reason for the following : (i) Transition metals exhibit enthalpy of atomisation. (ii) Transition metals form interstitial compounds .

How do you prepare : (i) k_(2)MnO_(4) from MnO_(2) ? (ii) Na_(2)Cr_(2)O_(7) from NaCrO_(4) ? (b) Account for the following : (i) Mn^(2+) is more stable then Fe^(2+) towards oxidation to + 3 state. (ii) The enthelpy of atomization is lowest for Zn in 3d series of the transition elements. (iii) Actinoid elements show wide range of oxidation states.

PRADEEP-D- AND F-BLOCK ELEMENTS-CONCEPTUAL QUESTIONS
  1. (a) Following are the transition metal ions of 3d series: Ti^(4+),V^...

    Text Solution

    |

  2. Write the formula of different oxides of manganese. What is the oxidat...

    Text Solution

    |

  3. What is the effect of increasing pH on the colour of K(2)Cr(2)O(7) sol...

    Text Solution

    |

  4. In the titratin of Fe^(2+) ions with KMnO(4) in acidic medium, why dil...

    Text Solution

    |

  5. Give the relationship between the equivalent weight and molecular weig...

    Text Solution

    |

  6. Why is it not advisable to dissolve KMnO(4) in conc. H(2)SO(4) ?

    Text Solution

    |

  7. Why in permanganate ion, there is a covalency between Mn and oxygen ?

    Text Solution

    |

  8. When chromite ore FeCr(2)O(4) is fuse with NaOH in presence of air, a ...

    Text Solution

    |

  9. Briefly explain why electronic configuration of lanthanoids are not kn...

    Text Solution

    |

  10. The +3 oxidation states of langthanum ( Z= 57), gadolinium (Z= 64) and...

    Text Solution

    |

  11. The outer electronic configuration of two members of the lanthanoid se...

    Text Solution

    |

  12. Why Zr and Hf or Nb and Ta exhibit similar properties? Or Zirconium ...

    Text Solution

    |

  13. Why Sm^(2+), Eu^(2+) and Yb^(2+) ions in solutions are good reducing a...

    Text Solution

    |

  14. One among the langthanides ,Ce(III), can be easily oxidized to Ce(IV)(...

    Text Solution

    |

  15. Which out of the two, La(OH)(3) and Lu(OH)(3) is more basic and why ?

    Text Solution

    |

  16. The electronic configuration of actinide elements are not known with c...

    Text Solution

    |

  17. How would you account for the fact that actinoids exhibit a larger num...

    Text Solution

    |

  18. The actinide contraction differs from lanthanide contraction ? Explai...

    Text Solution

    |

  19. Account for the following : (i) Oxidizing power in the series : VO^(...

    Text Solution

    |

  20. Account for the following : (a) Europlum (II) is more stable than ce...

    Text Solution

    |