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They are hard because of the strong attractive forces keeping ions together; they are brittle because: Ionic crystals may split apart when hit in the same direction as the layers of Ions

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Excellent exploded view lattice, just need to add in remaining ions and great explanation of why ions are closely packed.

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I should be an artist

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Each Cl- surrounded by 6 Na+ and vice-versa. Cl- represented slightly larger to show size difference.

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Excellent 2D general structure

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Almost perfect example! Just need to draw Cl- ions a little larger and add a key.

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Great attempt but need to add more ions to show that each ion is surrounded by 6 others.

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Excellent 2D arrangement that also shows alternating Na+ and Cl- ions