Question

Sc3+ and zn2+ are coloueless . Give scientific reason.

Answer 1

Answer:

Because they are completely filled d-orbital

Answer 2

Colour in a species arises due to electronic transition.

• The electronic configuration of Sc+3 is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6}$
• Thus it has fulfilled p orbital and vacant d orbital. So, the electronic transition does not take place and the species remain colourless.
• The electronic configuration of Zn+2 is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {3d}^{10}$
• Thus it has filled d orbital. That's why Zn+2 is stable. So, the electronic transition does not take place and the species remain colourless.