For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct:
A
a=b=c and α=β=γ=900
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B
a≠b≠c and α≠βandγ≠900
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C
a=b=c and α≠β≠γ=900
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D
a≠b≠c and α=β=γ=900
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Solution
The correct option is Aa=b=c and α=β=γ=900 For 3D-space lattice, there are seven unique and basic unit-cell shapes (primitive unit cells) with varying elements of symmetry in a three-dimensional space.
Out of 7 crystal system, only cubic and rhombohedral has same length for all the sides.
Cubic crystal system: a=b=c;α=β=γ=90o NaCl,ZnS and Cu are examples of cubic crystals.