Ionic compounds of alkali metals are colourless. Why?

Asked by toothbrush | 23rd Dec, 2009, 09:01: AM

Expert Answer:

Alkali metals have low ionisation enthalpies.

Also, in alkali metals d-d transitions are not possible which are possible in transition metal ions.

Therefore, the compunds formed by alkali metals are colourless and are damagnetic.

However they form coloured compounds on combining with coloured ions like MnO4- , Cr2O72- etc.

 

Answered by  | 24th Dec, 2009, 09:05: AM

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