Predict the coordination number of Ca2+ in CaO crystal and also its crystal structure. [Hint: use data for ionic radii values given in your Unit]
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answer:- 6
In CaO crystal, Ca2+ is a cation and O2- is an anion.
Cationic (Ca2+) has radius 100 pm and anionic (O2-) has radius 145 pm.
Ratio of cationic/anionic radius is:
r⁺/r⁻ = 100 / 145
r⁺/r⁻ = 0.69
As 0.414 < 0.69 < 0.732, CaO will form FCC lattice.
Coordination number in FCC lattice is 6.
therefore CN of Ca2+ must be 6.
and here is the crystal structure
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coordination number of CaO in ionic structure ??
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