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Transition elements

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The elements in which last two shells are incompletely filled are called Transition elements . They belong to d-block of Modem Periodic Table.
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Explore conceptually related problems

Assertion (A): Except Scandium all 3d series, transition elements exhibit variable oxidation states, Reason (R): By loosing electrons from (n-1)d orbital and ns orbital as the energy difference between them is very small

Assertion (A): In 3d transition elements, the expected decrease in atomic radius is observed from Sc to V, thereafter upto Cu, the atomic radius nearly remains the same. Reason (R): As we move from Sc to V, the added 3d electrons only partially shield the increased nuclear charge but upto Cu, the extra electron added to 3d sub-shell repel the 4s electrons and the slight increase in nuclear charge operated in opposite direction and it leads to constancy in atomic radii.

Knowledge Check

  • I. Transition elements do not have tendency to form corrdination compounds II. Transition metal ions are highly charged . III. Transition metal ions have vacant low energy orbitals IV . Transition metal hydrides are used as powerful reducing agents .

    A
    I , II and III only
    B
    I, II and IV only
    C
    I, II and IV only
    D
    I, II , III and IV

  • Of these statement which statement incorrect In most of the transition element are "______"

    A
    hexagonal close packed
    B
    cubic close packed
    C
    face centered cubic
    D
    symmetrical distribution

  • The trend in ionisation enthalpy of a transition element is not regular because ,

    A
    removal of one electron alters te relative energies of 4s and 3d orbitals
    B
    due to different electronic configuration (stability)
    C
    Poor screening of 3p- orbital
    D
    due to decrease in effective nuclear charge

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    This transition element with the lowest atomic number is

    Why d- block elements are known as transition element ?

    Which transition element show highest oxidation state

    The middle transition element ..... has six different oxidation states.

    Which one of the following transition element has maximum oxidation states?

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