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In two dimension, there are square close packing \& Hexagonal close packing. In three dimension, however
\( \mathrm{P} \) threre are HCP, BCC and CCP arrangement. Unoccupied

WV space in packing is known as void which may be octahedral, tetrahedral or cubic void and formation of void depends on atomic or ionic arrangment in crystal. In certain metallic oxide, metal M occupy HCP lattice \& \( \mathrm{O}^{-2} \) occupy \( \frac{2}{3} \) rd of octahedral void, formula of crystal is -
(A) \( \mathrm{M}_{2} \mathrm{O}_{3} \)
(B) \( \mathrm{MO}_{2} \)
(C) \( \mathrm{M}_{2} \mathrm{O}_{1} \)
(D) \( \mathrm{M}_{3} \mathrm{O}_{2} \)
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