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Why actinoid contraction is more than la...

Why actinoid contraction is more than lanthanoid contraction

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### Step-by-Step Solution: 1. **Understanding Contraction**: - Contraction refers to the decrease in the size of the elements as we move across the series of lanthanoids or actinoids. This occurs due to increased nuclear charge without a corresponding increase in shielding. 2. **Identify the Series**: - The lanthanoid series consists of elements with atomic numbers 57 to 71 (lanthanum to lutetium), while the actinoid series consists of elements with atomic numbers 89 to 103 (actinium to lawrencium). ...
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The extent of actinoid contraction is greater than lanthanoid contraction. Explain.

(a) How would you account for the following: (i) Actinoid contraction is greater than lanthanoid contraction. (ii) Transition metals form coloured compounds. (b) Complete the following equation : 2MnO_(4)^(-)+6H^(+)+5NO_(2)^(-)to

Knowledge Check

  • Actinoid contraction is more than lanthanoid contraction because

    A
    Energy of 4 f and 5f orbitals are same
    B
    5 f orbitals are more diffused as compared to 4 f orbitals
    C
    Actinoids show greater range of oxidation states than lanthanoids
    D
    Actinoids are highly reactive

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    (a) How would you account for the following : (i) Actinoid contraction is greater than lanthanoid contraction (ii) Transition metals from coloured compound. (b) Complete the following equation. 2MnO_(4)^(-) + 6H^(+) + 5NO_(2)^(-) rarr

    Does actinoids show actinoid contraction similar to lanthanoid contraction ?

    Assign reasons for the following : (i) Cu(I) ion is not known to exist in aqueous solutions. (ii) Transition metals are much harder than the alkali metals. (iii) From element to element actinoid contraction is greater than the lanthanoid contraction.

    (a) How would you account for the following : (i) Actinoids contraction is greater than Lanthanoids contracation. (ii) Transition metals form coloured compounds. (b) Complete the following : 2MnO_(4)^(-)+6H^(+)+5NO_(2)^(-) to

    Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

    What is lanthanoid contraction?

    What is lanthanoid contraction ?

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