ALLOTROPS
Any of two or more forms of the same chemical element.
They may have different arrangements of atoms in crystals of the solid—for example, graphite and diamond for carbon—or different numbers of atoms in their molecules—for example, ordinary oxygen (O2) and ozone (O3). Other elements that have allotropes include tin, sulfur, antimony, arsenic, selenium and phosphorus.
source: Britannica encyclopedia
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