Ionic solids , which have anionic vacancies due to metal excess defect , develop colour. Explain with the help of a suitable example.

When we add extra metal to the lattice, it provide extra electrons to the lattice and the anions of the lattice leave their lattice points . These vacant sites are occupied by the electrons. And the free electron can easily absorb energy and can jump to higher level.

As these energy transitions are in visible spectrum of light so the crystal appears to be coloured.

For example in case of NaCl crystal, when we heat it the crystal appear yellowish.

Published by Ankush Sharma

I am M.Sc (chemistry ) from Punjabi University Patiala. I am a science teacher with expertise in chemistry, with 8 years of experience in teaching. Writing and blogging is my hobby, I write whenever I am free. I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

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