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.
tutorsglobe.com respiration assignment help-homework help by online energy and enzymes tutors
Theory and lecture notes of all along with the key concepts of Correlation and Regression, Clearing Existing Data, Scatter Plots, Least Squares Regression Line, Regression Line on the Scatter Plot. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Linear Models and Scatter Plots.
Jumstart with our Theories of Human Communication Assignment Help and get authentic and A++ solutions at fair prices!
Finding out topmost Political Theory Assignment Help service at reasonable rates? Avail it from qualified tutors!
Theory and lecture notes of Contingency tables on the TI-82 all along with the key concepts of contingency tables on the ti-82, homework help, assignment help. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Contingency tables on the TI-82.
Phyla Mollusca and Echinodermata tutorial all along with the key concepts of Features of Phyla Mollusca and Echinodermata, Adaptations and Development, Classification of mollucs, Features of Echinoderms and Symmetries of Echinoderms
Theory and lecture notes of Equilibrium in the Flexible-Price Model all along with the key concepts of equilibrium in the flexible-price model, Real Interest Rate, Capital Inflow, Flow-of-Funds Market. Tutorsglobe offers homework help, assignment help and tutor’s assistance on equilibrium in the flexible-price model.
tutorsglobe.com html assignment help-homework help by online computer programming tutors
tutorsglobe.com monohybrid cross assignment help-homework help by online crossing techniques tutors
www.tutorsglobe.com offers shape of molecules homework help, shape of molecules assignment help, online tutoring assistance, organic chemistry solutions by online qualified tutor's help.
www.tutorsglobe.com offers elements of the analysis model homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
what is Incentive Plans? To eliminate the defects of both piece-wage and time wages systems, incentive plans are employed. Within these plans, the benefits of time and piece wage systems are joint and incentives are offered to workers to work hard.
tutorsglobe.com vitamins assignment help-homework help by online nutrition tutors
Cost and Financial Accounts are considered as be interlocked while independent set of books are kept for each of them. Those accounts are interlocked by control accounts kept in the two sets of text books.
liquidity ratios are considered with the capability of the business to meet its short-term financial obligations.
1952395
Questions Asked
3689
Tutors
1463756
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!