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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:
Electronic configurations
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उत्तर १
The electronic configurations of the elements of the same group are generally similar.
The first transition series shows two exceptions:
Cr = 3d5 4s1 and Cu = 3d10 4s1
The second series shows more exceptions:
Mo (42) = 4d5 5s1, Tc (43) = 4d6 5s1, Ru (44) = 4d7 5s1, Rh (45) = 4d8 5s1, Pd (46) = 4d10 5s0, Ag (47) = 4d10 5s1
Similarly, the third series shows exceptions:
W (74) = 5d4 6s1, Pt (78) = 5d9 6s1 and Au (79) = 5d10 6s1
Therefore, in many cases in the horizontal series, the electronic configurations of the three series are not the same.
उत्तर २
The first transition series gradually fills 3d-orbitals, whereas the second and third transition series gradually fill 4d-orbitals and 5d-orbitals, respectively.
Notes
Students can refer to the provided solutions based on their preferred marks.
संबंधित प्रश्न
Explain why is Fe3+ more stable than Fe2+?
Why +2 oxidation state of manganese is more stable?
Account for the following:
Zn is not considered as a transition element.
How would you account for the irregular variation of ionization enthalpies (first and second) in the first series of the transition elements?
Explain why Cu+ ion is not stable in aqueous solutions?
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:
Cobalt (II) is stable in aqueous solutions, but in the presence of complexing reagents, it is easily oxidised.
How would you account for the following:
The d1 configuration is very unstable in ions.
NF3 is possible, but NF5 is not. Why?
The paramagnetic character in the 3d-transition series elements increases up to Mn and then decreases.
Give reasons for the following:
The transition metals generally form coloured compounds.
Electronic configuration of Mn2+ is ____________.
Which of the following statements is not correct?
Answer the following question:
Which element of the first transition series has highest second ionisation enthalpy?
Which of the following is non-metallic?
The spin magnetic moment of cobalt in the compound Hg [Co(SCN)4] is:-
Which does not belong to first transition series?
Which of the following ions will exhibit colour in aqueous solution?
In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is ______ × 10-1 BM.
(Round off to the nearest integer).
[Given: `sqrt3 = 1.73, sqrt2 = 1.41`]
Account for the following:
Ce4+ is a strong oxidising agent.
