For each of the following ions, draw diagrams (on a piece of paper), like the one to the right below, to show orbital occupancies for both weak and strong octahedral fields. Indicate (on the table below) the total number of unpaired electrons in each case. (a) (b) (c) (d) (e) Ion Mo4+ Ni3+ Zn²+ Fe²+ Cr²+ #Unpaired # Unpaired Weak field Strong field 129

For each of the following ions, draw diagrams (on a piece of paper), like the one to the right below, to show orbital occupancies for both weak and strong octahedral fields. Indicate (on the table below) the total number of unpaired electrons in each case. (a) (b) (c) (d) (e) Ion Mo4+ Ni3+ Zn²+ Fe²+ Cr²+ #Unpaired # Unpaired Weak field Strong field 129

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter19: Transitition Metals, Coordination Chemistry And Metallurgy

Section: Chapter Questions

Problem 19.4QE

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(a) Calculate the number of unpaired electrons in the following gaseous state ions: Mn2+, Cr3+, V3+ and Fe2+ which one of these in the most stable in aqueous solutions? (At. nos. V = 23, Cr = 24, Mn = 25, Fe = 26) (b) Explain the following observations: (i) The transition metal ions are usually coloured in aqueous solutions. (ii) Cu(I) is not stable in an aqueous solution. (iii) The highest oxidation state of a transition metal is exhibited in its oxide or fluoride.
For each of the following ions, draw diagrams like thosein Figure 8.18 to show orbital occupancies in both weakand strong octahedral fields. Indicate the total number ofunpaired electrons in each case.(a) Mn2+ (c) Cr3+ (e) Fe2+(b) Zn2+ (d) Mn2+
For each of the following ions, draw diagrams (on a piece of paper), like the one to the right below, to show orbital occupancies for both weak and strong octahedral fields. Indicate (on the table below) the total number of unpaired electrons in each case. Ion # UnpairedWeak field # UnpairedStrong field (a) Rh4+ (b) Ni2+ (c) Fe2+ (d) Nb2+ (e) Cr4+
For each of the following ions, draw diagrams (on a piece of paper), like the one to the right below, to show orbital occupancies for both weak and strong octahedral fields. Indicate (on the table below) the total number of unpaired electrons in each case. Ion # Unpaired Weak field # Unpaired Strong field (a) Pd4+ (b) Cr3+ (c) Cd2+ (d) Ni2+ (e) Co2+
For each of the following ions, draw diagrams (on a piece of paper), like the one to the right below, to show orbital occupancies for both weak and strong octahedral fields. Indicate (on the table below) the total number of unpaired electrons in each case. (a) (b) (c) (d) (e) Ion Pd³+ Mn³+ V²+ Cu²+ Cr4+ Submit Answer # Unpaired # Unpaired Weak field Strong field eg t2g do 17
Assign reasons for each of the following :(i) Transition metals generally form coloured compounds.(ii) Manganese exhibits the highest oxidation state of +7 among the 3d series of transition elements.
Explain the following observations :(i) Copper atom has completely filled d orbitals (3d10) in its ground state, yet it is regarded as a transition element.(ii) Cr2+ is a stronger reducing agent than Fe2+ in aqueous solutions.
How would you account for the following: (i) Metal-metal bonding is more extensive in the 4d and 5d series of transition elements than the 3d series. (ii) Mn(III) undergoes disproportionation reaction easily. (iii) Co (II) is easily oxidised in the presence of strong ligands
The elements of the actinide series are shown in the diagram. Some of the actinides ions are not coloured and some given most of the actinides ions are coloured. (i) What are two (2) colourless actinides ions? (ii) Explain the different colouration possess by the ions in the actinide series.
Use condensed electron configurations to write an equation for the formation of eachtransition metal ion, and predict whether it is paramagnetic:(a) Fe3+ (Z=26) (b) Mn3+ (Z =25) (c) Cu+(Z=29)
Explain giving a suitable reason for each of the following :(i) Transition metals and their compounds are generally found to be good catalysts.(ii) Metal-metal bonding is more frequent for the 4d and the 5d series of transition metals than that for the 3d series.
Explain the ways in which the elements act: (a) How do you explain that fluoride, a small anion, is responsible for a weak field while water, a neutral molecule, gives rise to a much stronger binding field? (b) Explain why, for the same metallic cation and the same ligands, the energy of the binding field is lower in tetrahedral compounds than in octahedral compounds.