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Bohrs Derivations

Colour of C...

Question

Colour of ${C r}^{n +}$ ion solution has a green colour due to $d - d$ transition in its orbits then the minimum value of $n$ is:

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Solution

$C r^{n +} ⟶ C r^{4 +} 4 s^{0} 3 d^{2}$ ; $C r^{5 +} 4 s^{0} 3 d^{1}$
$C r^{3 +} 4 s^{0} 3 d^{3}$
More is the number of unpaired $e^{-}$ more $d - d$ transition is possible.

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