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The atomic radii of transition elements ...

The atomic radii of transition elements in a period are.

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In case of transition elements, the electrons are filled in ( n-1)d-sub-shell and they exert screening effect as a result of which the atomic sized is expected to increase. Thus, as we move from left to the right in a tranisition series, the increase in the magnitude of nuclear charge ( leading to decrease in size ) is almost balanced by the increase in the shielding effect ( leading to increase in size ). Because of these two opposing tendencies, there is a very small change in the atomic size ( or atomic radii ) as we move along the transition series. IN s and p-block elements, as we move along a period the electrons are filled in the valence s and p orbitals. These electrons do not exert as much screening effect as are exerted by the electons present in the d- orbitals. There is a gradual increase in effective nuclear charge leading to decrease in atomic size along a particular period.
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The atomic radii of the elements of second period are given below: (a) Arrange these elements in the decreasing order of their atomic radii (Keeping the element with the largest atomic radius first). (b) Are the elements now arranged in the pattern of a period in the periodic table? (c) Which elements have the largest and the smallest atoms? (d) From this data, infer how the atomic size (or atomic radius) of the elements changes as you go from left to right in a period?

Wxplain the following giving suitable reson. (a). Transitin metals of 3d-series doe not react readily with dilute acids to liberate hydrogen although they have high negative reduction potential values. Explain. (b). The atomic radii of the elements in a transition series do not vary much while they do vary in the case of s and p-block elements. Explain. (c). The second and third members in each group of the transition elements group of the transition elements have similar atomic radii. Explain.

Knowledge Check

  • The atomic radii of transition elements in a row are___________.

    A
    smaller than those of s-block as well as p-block elements
    B
    greater than those of s-block as well as p-block elements
    C
    smaller than those of s-block but greater than those of p-block elements
    D
    greater than those of s-block but smaller than those of p-block elements

  • The atomic radii of transition series elements

    A
    increas as thatomic number increases.
    B
    decrease as atomic number increases.
    C
    remains almost constant.
    D
    increase as atomic mass decreases.

  • The atomic radii of transition elements from Cr to Cu are almost equal because

    A
    Increased effective nuclear charge is balanced by decreased screening effect of (n-1)d or bitals.
    B
    Increased effective nuclear charge is balanced by increased screening effect of (n-1)d or bitals
    C
    Decreased effective nuclear charge is balanced by increased screening effect of (n-1)d orbitals
    D
    Decreased effective nuclear charge is balanced by decreased screening effect of (n-1)d orbitals

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    The atomic radii of first group elements of the Periodic Table are as follows: (i) Arrange these elements in the increasing order of their atomic radii. (ii) Name the elements which have the smallest and the largest atoms. (iii) How does the atomic size vary as you go down a group?

    Give reason for the following : Variations in the radii of transition elements are not as pronouced asthose of representative elements.

    Give reasons for the following : Variation in the radii of transition elements are not as pronounced as those of representative elements.

    The first transition element in the periodic table is

    The total number of inner transition elements in the periodic table is

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