Diamond & graphite are allotropes of carbon. Explain how they differ in terms of their molecular structure & why diamond is denser than.. graphite?

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In diamond the carbon  atoms are bonded to one another in a 3-D array with every carbon atom bonded to four others in a tetrahedral shape.  In graphite each carbon atom is bonded to 3 others in a hexagonal flat shape.  The result is that diamond has a very stiff, rigid structure while graphite exists in sheets which can, to a degree, slide past each other.  Use the link below to build diamond and graphite.

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