Define coordination number of a crystal.

Define coordination number in crystals. Is the coordination number of a sphere in ccp and hcp arrangement same or different?

Co-ordination number of FCC crystal is -

Co-ordination number of HCP crystal is -

The coordination number of a metal crystallising in a hexagonal close-packed structure is :

In aluminates coordination number of Al is :

In cupramine sulphate complex find out the oxidation number and coordination number of copper.