Lanthanide Contraction refers to the progressive decrease in the atomic and ionic radii of the lanthanide series elements from cerium (Ce) to lutetium (Lu). This phenomenon occurs despite the increase in atomic number across the series. Understanding lanthanide contraction is crucial as it influences the chemistry of the subsequent elements in the periodic table.
Therefore, the lanthanide contraction from Ce to Lu is \( \boxed{0.10 \, \text{Å}} \).
Europium (Eu) resembles Calcium (Ca) in the following ways:
(A). Both are diamagnetic
(B). Insolubility of their sulphates and carbonates in water
(C). Solubility of these metals in liquid NH3
(D). Insolubility of their dichlorides in strong HCI
Choose the correct answer from the options given below: