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| 1. |
La^(3+)(Z=57) and Lu^(3+)(Z=71) do not show any colour in solutions. |
| Answer» Solution :CONFIGURATIONOF `La^(3+) is 4f^(0)` and that of `LU^(3+) is 4f^(14)` . Due to the ABSENCE of partially filled f-orbitals, `La^(3+)` and `Lu^(3+)` do not show any colour in solution. | |