How would you account for the following?(i) Many of the transition elements are known to form interstitial compounds.(ii) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the second (4d) series.(iii) Lanthanoids form primarily +3 ions, while the actinoids usually have higher oxidation states in their compounds, +4 or even +6 being typical.

How would you account for the following?(i) Many of the transition elements are known to form interstitial compounds.(ii) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the second (4d) series.(iii) Lanthanoids form primarily +3 ions, while the actinoids usually have higher oxidation states in their compounds, +4 or even +6 being typical.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter8: Bonding In Transition Metal Compounds And Coordination Complexes

Section: Chapter Questions

Problem 33P

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Explain the following observations: (i) The enthalpies of atomisation of transition metals are quite high. (ii) There is a close similarity in physical and chemical properties of the 4d and 5d series of the transition elements, much more than expected on the basis of usual family relationship. (iii) The members in the actinoid series exhibit larger number of oxidation states than the corresponding members in the lanthanoid series.
Describe how magnetism in lanthanides series arises
Give an explanation for each of the following observations: (i) The gradual decrease in size (actinoid contraction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction). (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbital configuration (d4), Cr2+ ion is a reducing agent but Mn3+ ion is an oxidising agent.
What are the coordination numbers of cobalt(III), plat-inum(II), and platinum(IV) in complexes?
Molecular nitrogen (N2) can act as a ligand in certaincoordination complexes. Predict the structure of [V(N2)6],which is isolated by condensing V with N2 at 25 K. Is thiscompound diamagnetic or paramagnetic? What is theformula of the carbonyl compound of vanadium that hasthe same number of electrons?
1) Why are lanthanide complexes always weak field in nature , second and third d-transition metal complexes are nearly always strong field cases , and first d-transition series metal complexes exhibit both weak and strong field cases? 2) Sketch the structure for the [PtCl3(H2C=CH2)]- anion and describe the platinum(II)-ethene bonding.
1. Give a diagram and explain briefly how the d orbital degeneracy is removed in an octahedral complex in which a transition metal atom is surrounded by 6 ligands.
Of the first-row transition metal complexes of formula [M(NH3)6]3+, which metals are predicted by the Jahn– Teller theorem to have distorted complexes?
(a) Write the electronic configuration of Ce3+ ion, and calculate the magnetic moment on the basis of ‘spin-only’ formula. [Atomic No. of Ce = 58] (b) Account for the following: (i) Thf enthalpies of atomisation of the transition metals are high. (ii) The lowest oxide of a transition metal is basic, the highest is amphoteric/ acidic. (iii) Cobalt (II) is stable in aqueous solution but in the presence of complexing agents, it is easily oxidised.
Explain giving reasons :(i) Transition metals and their compounds generally exhibit a paramagnetic behaviour.(ii) The chemistry of actinoids is not so smooth as that of lanthanoids.
Give 5 examples of metal coordination complexes and enumerate their importance
Give an example of a double salt that can be formed via ligand exchange and give the reactions involved