Home
Class 12
CHEMISTRY
Give reason. Atomic size of 4d and 5d ...

Give reason.
Atomic size of 4d and 5d series elements are almost the same.

Text Solution

Verified by Experts

Due to lanthanoid contraction.
Promotional Banner

Topper's Solved these Questions

  • SURFACE CHEMISTRY

    SUBHASH PUBLICATION|Exercise Questions|79 Videos

  • THE 'P'-BLOCK ELEMENTS

    SUBHASH PUBLICATION|Exercise EXERCISE|86 Videos

Similar Questions

Explore conceptually related problems

Give reason : (i) Most of the transition metals have high melting point and boiling point (ii) 2^(nd) ionization enthalpy of Cu is exceptionally high. (iii) atomic size of 4d- and 5d-series elements are almost the same.

Atomic size of 3d-series elements from chromium to copper is almost the same. Give reason.

How will you account for the following? (i) Actionoids exhibit more number of oxidation states than lanthanoides. ii) Atomic fadii of second and third transition series elements are almost identical.

How will you accout for the following ? (i) Actinoids exhibit more number of oxidation states than lanthanoids. (ii) Atomic radii of second and third transition series elements are almost identical.

Observe the given table and question: answer the following {:("Elements", A, B, C, D, E),("Atomic number", 11,4,2,7,19):} Identify the two elements that belong to the same period and the two elements that belong to the same group. Give reason for your conclusion.

How would you account for the following: (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii) The E^0 value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple or Fe^(3+)//Fe^(2+) couple.

Given below are some elements of the Modern Periodic Table: ""_(4)Be, ""_(26)Fe.""_(14)Si, ""_(19)K ""_(20)Ca i) Select the element that has one electron in the outermost shell and write its electronic configuration. ii) Select two elements that belong to the same group. Give reason. iii) Select two elements that belong to the same period. Which one of the two has a bigger atomic size?

How would you account for the following: (i) Among lanthanoids, Ln (III) compounds are predominant. However, occasionally in solutions or in solid compounds, +2 and +4 ions are also obtained. (ii) The E_(M^(2+)//M)^(0) for copper is positive (0.34 V). Copper is the only metal in the first series of transition elements showing this behaviour. (iii) The metallic radii of the third (5d) series of transition metals are nearly the same as those of the corresponding members of the second series.

SUBHASH PUBLICATION-THE 'd' - AND 'f' - BLOCK ELEMENTS -Question and Answer
  1. What happens when lanthanoids are heated in Carbon?

    Text Solution

    |

  2. How lanthanoids reacts with water and dil. Acids?

    Text Solution

    |

  3. What is mischmetall? Give its one use.

    Text Solution

    |

  4. What is actinoid contraction? Why actinoid contraction is greater than...

    Text Solution

    |

  5. Give reason: Actinoid contraction is greater from element to element t...

    Text Solution

    |

  6. Give general oxidation state of actinoids. Why actinoids shows variabl...

    Text Solution

    |

  7. Zr and Hf have almost identical atomic radii. Give reason.

    Text Solution

    |

  8. Give reasons: Actinoids show variable oxidation states.

    Text Solution

    |

  9. Give reasons: Zr and Hf have almost identical radii.

    Text Solution

    |

  10. Give reason: Why Lanthanoids are less reactive than actinoids.

    Text Solution

    |

  11. Out of the following elements identify the element which does not exhi...

    Text Solution

    |

  12. Give Reason. Most of the transition metals have high melting point a...

    Text Solution

    |

  13. Give Reason. Second ionisation enthalpy of copper is exceptionally h...

    Text Solution

    |

  14. Give reason. Atomic size of 4d and 5d series elements are almost the...

    Text Solution

    |

  15. Study of actinoid elements is difficult. Give two reasons.

    Text Solution

    |

  16. Give reasons : Cerium (Ce) exhibits +4 oxidation state

    Text Solution

    |

  17. Among Fe^(2+) and Fe^(3+) which is more stable? Give reason.

    Text Solution

    |

  18. Give reason: Mn exhibits the higher oxidatoin state of +7 among 3d s...

    Text Solution

    |

  19. Give reason: Cu^(2+) is paramagnetic and Cu^(+) is diamagnetic.

    Text Solution

    |

  20. Give reason 'transition metals generally form coloured compound'.

    Text Solution

    |