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There is a gradual decrease in the size ...

There is a gradual decrease in the size of atoms or `M^(3+)` ions across the series in actinoids. This is called _____________.

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actinoid contraction
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Explore conceptually related problems

Give an explanation for each of the following observations : (i) The gradual decrease in size (actinoid contraction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction). (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbital configuration (d^4) , Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent.

(a) Complete the following chemical equations for reactions : (i) MnO_(4(aq))^(-) + S_(2)O_(3(aq))^(2-) + H_(2)O_((l)) to (ii) Cr_(2)O_(7 (aq))^(2-) + H_(2)S_((g)) + H_((aq))^(+) to (b) Give an explanation for each of the following observations : (i) The gradual decrease in size (actinoid contraction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction.) (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbitals configuration (d^(4)) Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent .

Knowledge Check

  • Consider the following statements. I. There is a gradual decrease in the size of atom or M^(3+) ions across the series. II. This is referred to as the actinide contraction. The correct statement(s) is /are (choose the appropriate option)

    A
    Only I
    B
    Only II
    C
    Both I and II
    D
    Neither I nor II

  • A gradual decrease in size of tail during metamorphosis of frog is due to

    A
    Cell mecrosis
    B
    Pinocytic activity
    C
    Programmed cell death
    D
    Cell senescence

  • The decreasing order of size of ions is :-

    A
    `Br^(-) gt S^(-2) gt Cl^(-) gt N^(-3)`
    B
    `N^(3-) gt S^(-2) gt Cl^(-) gt Br^(-)`
    C
    `Br^(-) gt Cl^(-) gt S^(-2) gt N^(-3)`
    D
    `N^(-3) gt Cl^(-) gt S^(-2) gt Br^(-)`

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    Which of the following atom or ions has the smallest size?

    The steady decrease in atomic size in lanthanide series is called lanthanide confraction and in all amounts to

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