Solid state

The binding forces operating between molecules

The correlation between structure and properties

The fixed positions of the constituent particles (correct)

The ability of molecules to move freely

Because of their high rigidity

Because they can only oscillate about their mean positions

Because they have fixed positions

Because their molecules are free to move about (correct)

Because they have potential to provide tougher materials (correct)

Because they are less conductive than copper

Because they are heavier than aluminium

Because they are heavier than steel

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