d- and f-Block Elements: Class 12 Chemistry Q&A
2 free answers on d- and f-Block Elements (Chemistry) for Class 12 students, across CBSE, ICSE and State boards. Includes questions such as “[Ni(NH₃)₆]²⁺ paramagnetic or diamagnetic?”, “What is lanthanoid contraction?”
Question & Answer
Questions
- ChemistryClass 12CBSE
[Ni(NH₃)₆]²⁺ paramagnetic or diamagnetic?
Paramagnetic — Ni²⁺ is d⁸ with t₂g⁶ eg² configuration → 2 unpaired electrons in the eg orbitals.
- ChemistryClass 12All
What is lanthanoid contraction?
Lanthanoid contraction refers to the steady decrease in the size of the atoms and ions of the elements in the lanthanide series (also known as lanthanoids) as one moves from left to right across the periodic table, from lanthanum (La, atomic number 57) to lutetium (Lu, atomic number 71). This phenomenon has significant implications in chemistry, particularly in the field of inorganic chemistry. Here are some key aspects of lanthanoid contraction: Cause of Lanthanoid Contraction: The c