Saved Bookmarks
| 1. |
The correct order of atomic radii is : (1) Ce > Eu > Ho > N (2) Eu > Ce > Ho > N (3) Ho > N > Eu > Ce (4) N > Ce > Eu > Ho |
|
Answer» Correct option: (2) Eu > Ce > Ho > N Explanation: Atomic radic gradually decrease along the series. If we consider the atomic (i.e., metallic) radii for the lanthanides, two peaks appear at (63Eu [Xe] 4f7 5d0 6s2) and 70Yb [Xe] 4f14 5d0 6s2. Eu and Yb each can provide only 2 electrons for metallic bonding while the other members each can provide 3e– for the bonding purpose. |
|