Elements allotropes

Element (allotrope) Temperature range/°C Crystal structure Fattice parameters/pm Atomic volume, iyio6pm3 Molar volume/ cmVmol Density/ g/cm3... 

Element (allotrope) Crystal Lattice parameters/ Atomic Molar Density/... 

The color of an element sometimes depends on how the atoms of the element bond together. When the atoms of an element can bond in more than one way, we call the resulting forms of the element allotropic forms. 

The three solid elemental (allotropes) forms of carbon (a) diamond, (b) graphite, and (c) buckminsterfullerene. The representations of diamond and graphite are just fragments of much larger structures that extend in all directions from the parts shown here. Buckminsterfullerene contains molecules, one of which is shown. 

Allotropes of an element are dilferent structural modifications of that element. Allotropes of sulfur include cyclic... 

Definition Nonmetallic element allotropes wh. (yel.), red., bik. phosphorus Empirical P... 

For different forms of an element (allotropes), the entropy is higher in the form that allows the atoms more freedom of motion. For example, 5° of graphite is 5.69 J/moFK, whereas 5" of diamond is 2.44 J/moFK. In graphite, covalent bonds extend within a two-dimensional sheet, and the sheets move past each other easily in diamond, covalent bonds extend in three dimensions, allowing the atoms little movement (Table 12.6). 

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