Chemistry · Lanthanoids: Electronic configuration, oxidation states and Lanthanoid contraction
Which of the following factors may be regarded as the main cause of lanthanide c
Which of the following factors may be regarded as the main cause of lanthanide contraction?
- A. Greater shielding of 5 d-electron by 4 f-electrons
- B. Poor shielding of 5 d-electron by 4 f-electrons
- C. Effective shielding of one 4 f-electrons by another in the subshel
- D. Poor shielding of one of 4-electrons by another in the subshell
Step-by-step solution
Lanthanide contraction is primarily due to the poor shielding effect of 4f electrons. As the 4f subshell is filled across the lanthanide series, each additional 4f electron inadequately shields the nuclear charge, leading to an increase in effective nuclear charge. This causes a contraction in atomic and ionic radii.
Related MCQs
- The atomic and ionic radii \) of Lanthanide elements decrease with increase in atomic number. This effect is called as:…
- The Lanthanide contraction relates to:…
- The last element of lanthanide series is…
- Which of the following Lanthanoid is radioactive?…
- The lanthanide contraction is responsible for the fact that:…