a) A crystal is a solid whose atoms or ions are arranged in an orderly, repeating pattern in 3-dimensions. Crystals are represented by repeating subdivisions called 'unit cells', which incorporate the geometrical properties of the entire crystal. The arrangement of the crystal enables the atoms to be most closely packed with maximum amount of primary bonds and minimal energy of the aggregates; it is for this reason that the atoms are arranged in such a way.

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15 Νοε 2013 (πριν από 2 χρόνια και 11 μήνες)

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