Question

Copper(2) salts are coloured but copper(1) salts are colourless?​

Answer 1

Answer:

Copper(ll) or Cu2+ ion has outermost electronic configuration

$3 {d}^{9} 4 {s}^{0}$

So , actually it's d orbital is not fully occupied. Electron can be exchanged,and hence colour is shown.

In case of Copper (l) or Cu+ it has outermost electronic configuration

$3 {d}^{10} 4 {s}^{0}$

So , it's d orbital is fully occupied. Here d-d transition is not possible as it has no unpaired electron. Consequently, it's colourless.

PLEASE MARK AS BRAINLIEST ANSWER

DON'T FORGET TO PRESS ON THANKS IF YOU FIND IT HELPFUL