The Lanthanide Series:
The Lanthanide series comprise fifteen elements that is, lanthanum (57La) to lutetium (71 Lu). Lanthanum and Lutetium contain no partly filled 4f-subshell however contains electrons in 5d-subshell. Therefore such elements must not be involved in this series. Though, all these elements intimately resemble lanthanum and therefore are considered altogether.General properties of Lanthanides:1. Electronic configuration:
The electronic configuration of Lanthanides is listed in the table shown below. The fourteen electrons are filled in Ce to Lu through configuration [54Xe] 4f1-145d16s22. Oxidation states:
The general oxidation state displayed by all the lanthanides is +3 (Ln3+) in aqueous solutions and in their solid compounds. Several elements display +2 and +4 states as unusual oxidation states.
La - +3Ce - +3, +4, +2Pr - +3, +4Nd - +3, +4, +23. Radii of tripositive lanthanide ions:
The size of M3+ ions reduces as we move via the lanthanides from lanthanum to lutetium. This steady reduction in ionic radii of M3+ cations in the lanthanide sequence is termed as Lanthanide contraction.
Cause of lanthanide contraction:
The lanthanide contraction is due to the deficient shielding of one 4f electron by the other in similar sub shell. As we move all along the lanthanide sequence, the nuclear charge and the number of 4f electrons raise by one unit at each step.
Though, due to the imperfect shielding, efficient nuclear charge raises causing a contraction in electron cloud of 4f-subshell.
Latest technology based Chemistry Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in F Block Elements homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for F Block Elements, project ideas and tutorials. We provide email based F Block Elements homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in F Block Elements. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Inorganic-Chemistry Homework Help and assignment help services. They use their experience, as they have solved thousands of the Chemistry assignments, which may help you to solve your complex issues of F Block Elements. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
Basic Concept of Thermodynamics tutorial all along with the key concepts of Definition of Thermodynamics, Idea of System and Surrounding, Isochoric process, Isobaric process, Isothermal process, Cyclic Processes, Irreversible Process, Chemical Equilibrium, Equation of State, Van der Waals Equation of State
tutorsglobe.com wages assignment help-homework help by online marginal productivity theory of distribution tutors
Phylum Echinodermata tutorial all along with the key concepts of Features of Phylum Echinodermata, Class Asteroidea, Class Ophiuroidea, Class Echinoidea, Class Holothuroidea and Class Crinoidea
Avail unsurpassed Operating System Assignment Help service from 24x7 available top-rated tutors at viable prices to score high grades.
what is international trade? define some of basis of international trade, www.tutorsglobe.com offers theory and concepts of international trade, assignment help - international trade homework help.
Linkages between Pigments-Dyes tutorial all along with the key concepts of Definition of Dyes, Features of Dyes, Dyeing and Fabric, Conventional pigment dyeing system, Differences between Dyes and Pigments
www.tutorsglobe.com offers oxidation of alcohols homework help, oxidation of alcohols assignment help, online tutoring assistance, organic chemistry solutions by online qualified tutor's help.
tutorsglobe.com zero based budgeting assignment help-homework help by online budget tutors
tutorsglobe.com criticism of says law assignment help-homework help by online says law of market tutors
Protozoa-Phyla Rhizopoda tutorial all along with the key concepts of Characteristics of Phylum Rhizopoda, Amoeba and Phylum Apicomplexa-Sporozoa
Excellent dielectric strength, Very low dissipation factor, Remaining reasonably constant at high frequencies or within humid conditions. No mechanical or chemical stripping needed
Top load - involves a wider variety of available models, colors and features like they have been on the market longer, Front load - people are employed to seeing front load washers in Laundromats, several brands are now available for home use.
Sexual reproduction, above and beyond producing individuals, introduces variability in the offspring through combining traits of parents.
Theory and lecture notes of Multivariable Linear Systems all along with the key concepts of Row-Echelon Form, Gaussian Elimination, number of solutions to a linear system, Mathematical Models, Quadratic Model and Regression Parabola. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Multivariable Linear Systems.
The Phylum Annelida tutorial all along with the key concepts of characteristics of Annelida, Diversity of annelids, Classification of annelids, Class Polychaeta, Class Oligochaeta and Class Hirudinea
1936734
Questions Asked
3689
Tutors
1452619
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!