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प्रश्न
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Atomic sizes
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उत्तर
- Generally, ions or atoms of the same charge in a series show a gradual decrease in radius with increasing atomic number, although this decrease is very small.
- In the same respective vertical column (group), the size of the atoms of the 4d series is larger than that of the corresponding elements of the 3d series. However, the size of the corresponding elements of the 5d series is almost the same as that of the 4d series.
- The reason for this nearly identical size between 4d and 5d series elements is Lanthanoid Contraction, which cancels out the expected increase in size due to the addition of a new shell.
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संबंधित प्रश्न
Explain why is Fe3+ more stable than Fe2+?
Why +2 oxidation state of manganese is more stable?
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
What are inner transition elements?
How would you account for the following?
Zr (Z = 40) and Hf (Z = 72) have almost identical radii.
Why do transition metal ions possess a great tendency to form complexes?
Transition metals with highest melting point is ____________.
Maximum oxidation state is shown by ____________.
Transition elements form binary compounds with halogens. Which of the following elements will form \[\ce{MF3}\] type compounds?
(i) \[\ce{Cr}\]
(ii) \[\ce{Co}\]
(iii) \[\ce{Cu}\]
(iv) \[\ce{Ni}\]
Which of the following will not act as oxidising agents?
(i) \[\ce{CrO3}\]
(ii) \[\ce{MoO3}\]
(iii) \[\ce{WO3}\]
(iv) \[\ce{CrO^{2-}4}\]
Answer the following question:
Which element of the first transition series has highest third ionisation enthalpy?
Identify the metal and justify your answer.
Carbonyl \[\ce{M(CO)5}\]
Identify the metal and justify your answer.
\[\ce{MO3F}\]
Transition metals can act as catalysts because these can change their oxidation state. How does \[\ce{Fe(III)}\] catalyse the reaction between iodide and persulphate ions?
It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?
Photographic film and plates have - au essential ingredient of
The basic character of transition metals monoxide follow the order.
Which of the following transition metals shows +1 and +2 oxidation states?
Give a reason for the following:
Zinc, cadmium and mercury are considered as d-block elements but not regarded as transition elements.
