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La^(3+) (Z = 57) and Lu^(3+)(Z = 71) do ...

`La^(3+)` (Z = 57) and `Lu^(3+)`(Z = 71) do not show any colour in solutions. Give reason.

Text Solution

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`La^(3+)` (lanthanum) have `4 f^(0)` and `Lu^(3+)` (lutetium) have `4 f^(14)` configuration. Because of the absence of unpaired electrons, these ions impart no colour to the solution.
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