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प्रश्न
Account for the following:
In case of transition elements, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number.
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उत्तर
In case of transition elements, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. As the new electron enters a d orbital each time the nuclear charge increases by unity. The shielding effect of a d electron is not that effective, hence the net electrostatic attraction between the nuclear charge and the outermost electron increases and the ionic radius decreases.
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संबंधित प्रश्न
How would you account for the following?
Transition metals exhibit variable oxidation states.
How would you account for the following: Transition metals form complex compounds.
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
How would you account for the following:
Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.
Why is \[\ce{HCl}\] not used to make the medium acidic in oxidation reactions of \[\ce{KMnO4}\] in acidic medium?
Which of the following will not act as oxidising agents?
(i) \[\ce{CrO3}\]
(ii) \[\ce{MoO3}\]
(iii) \[\ce{WO3}\]
(iv) \[\ce{CrO^{2-}4}\]
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
Account for the following:
Sc3+ is colourless whereas Ti3+ is coloured in an aqueous solution.
Which of the following transition metals shows +1 and +2 oxidation states?
Explain the magnetic properties of d-block (or transition) elements.
