What is an Allotrope?An allotrope• is a variant of a substance consisting of only one type ofatom.• a new molecular configuration, with new physicalproperties.Allotropes of a given substance will often have substantialdifferences between each other. For example, oneallotrope of carbon, fullerene, is many times stronger andlighter than steel.
What is an Allotrope?• Allotropes are different formsof the same element.• Different bondingarrangements between atomsresult in different structureswith different chemical andphysical properties.• Allotropes occur only withcertain elements, in Groups 13through 16 in the PeriodicTable. This distribution ofallotropic elements isillustrated in Figure 1.Figure 1
Elements and Their AllotropesThe following slides are about a few common elementsand their allotropes... You will find allotropes ofCarbonPhosphorusOxygenSulphurBoronSilicon
Allotropes of Carbon A striking example of differing physicalproperties among allotropes is the caseof carbon. Solid carbon exists in twoallotropic forms: diamond and graphite.• Diamond is the hardest naturally occurringsubstance and has the highest melting point(more than 6,335°F [3,502°C]) of anyelement.• In contrast, graphite is a very soft material,the substance from which the "lead" in leadpencils is made. The 8 Allotropes of Carbon are: a)Diamond, b) Graphite, c)Lonsdaleite, d)Buckminsterfullerene, e) C540, f)C70,g)Amorphous, h) Carbon Nanotube