Question

Explain why cu+ ion is not coloured

Answer 1

Cu+ ion is not coloured because it have 10 d electrons, thus d - d transitions are not possible.

Answer 2

Answer: It contains no unpaired electron.

Explanation: Atomic number of copper is 29.

Number of electrons in titanium = 29

The electronic configuration of copper will be,

[tex]1s^22s^23s^23p^64s^13d^{10} [/tex]

The electronic configuration of $Cu^+$ will be,

$1s^22s^23s^23p^63d^{10}$

As we know that the unpaired electrons present in the ion show color due to the transition of the electrons from ground state to the excited state.

In case of , there is no unpaired electrons that means the shells are fully filled. So, they will not show any color. That's why $Cu^+$  is colorless.