Class practical: This impressive demonstration shows how easily the crystal comes apart if the blade is accurately aimed...
Demonstration: This model shows crystal growing by the addition of more polystyrene spheres.
Demonstration: This model shows atoms making up a crystal held together by spring-like forces.
Class practical: Students pile marbles into a cardboard tray and so find a convenient way of packing them together.
Class practical: This shows ready-made models, giving an opportunity to link the shapes of real crystals with an underlying...
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