Does $C u^{+}$ ion show colour?

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Solution

$C u^{+}$ is colourless as its configuration is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}$ .

In order to absorb visible light, an electron would have to move to a higher energy orbital. The difference in energy of the orbitals would have to equal the energy of a visible wavelength photon. For d orbital splitting, the energy difference is right for the visible range. Unfortunately for $d^{10}$ ions, the orbitals are full. The next empty orbital that an electron could move into is much higher in energy and would correspond to UV light.

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