MgO crystallizes in a cubic type crystal system. The ionic radii for Mg2+ and O2- are 0.066 and0.140 nm respectively One can conclude that the Mg2+ ions occupy
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a
a cubic hole in a simple cubic structure
b
every tetrahedral hole in a close packed structure
c
an octahedral hole in a cubic close packed structure
d
every other tetrahedral hole in a close packed structure
answer is C.
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Detailed Solution
rcra=0.0660.140=0.47 So, cation (Mg2+) fiftted in octahedral holesof O2- are present at fcc lattice point