Editing Allotropy (section)

===Non-metals===
{| class="wikitable"
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! Element
! Allotropes
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|[[Allotropes of carbon|Carbon]]
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* [[Diamond]] – an extremely hard, transparent crystal, with the carbon atoms arranged in a tetrahedral lattice. A poor electrical conductor. An excellent thermal conductor.
* [[Lonsdaleite]] – also called hexagonal diamond.
* [[Graphene]] – is the basic structural element of other allotropes, nanotubes, charcoal, and fullerenes.
* [[Q-carbon]] – a ferromagnetic, tough, and brilliant crystal structure that is harder and brighter than diamonds.{{dubious|date=February 2019}}
* [[Graphite]] – a semimetallic, soft, black, flaky solid, a good electrical conductor. The C atoms are bonded in flat hexagonal lattices ([[graphene]]), which are then layered in sheets.
* [[Linear acetylenic carbon]] (carbyne)
* [[Amorphous carbon]]
* [[Fullerene]]s, including [[buckminsterfullerene]], also known as "buckyballs", such as C<sub>60</sub>.
* [[Carbon nanotube]]s – allotropes having a cylindrical nanostructure.
* [[Allotropes of carbon#Schwarzites|Schwarzites]]
* [[Cyclocarbon]]
* [[Glassy carbon]]
* [[Superdense carbon allotropes]] – proposed allotropes
|-
|[[Nitrogen]]
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* [[Nitrogen|Dinitrogen]] – by far the most common and stable form of nitrogen, found in the air.
* [[Hexazine]]
* [[Octaazacubane]]
* [[Tetranitrogen]]
* [[Trinitrogen]]
* [[Solid nitrogen#Crystal structure|Solid nitrogen]]
|-
|[[Allotropes of phosphorus|Phosphorus]]
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* [[White phosphorus]] – crystalline solid of tetraphosphorus (P<sub>4</sub>) molecules
* [[Red phosphorus]] – [[Amorphous solid|amorphous]] [[polymer]]ic solid
* Scarlet phosphorus
* [[Allotropes of phosphorus#Violet or Hittorf's phosphorus|Violet phosphorus]] with [[monoclinic]] crystalline structure
* [[Allotropes of phosphorus#Black phosphorus|Black phosphorus]] – semiconductor, analogous to graphite
* [[Diphosphorus]] – gaseous form composed of P<sub>2</sub> molecules, stable between 1200&nbsp;°C and 2000&nbsp;°C; created e.g. by dissociation of P<sub>4</sub> molecules of white phosphorus at around 827&nbsp;°C
|-
|[[Allotropes of oxygen|Oxygen]]
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* [[Oxygen#Allotropes|Dioxygen]], O<sub>2</sub> – colorless (faint blue liquid and solid)
* [[Ozone]], O<sub>3</sub> – blue
* [[Tetraoxygen]], O<sub>4</sub> – [[Metastability|metastable]]
* [[Octaoxygen]], O<sub>8</sub> – red
|-
|[[Allotropes of sulfur|Sulfur]]
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* Cyclo-Pentasulfur, Cyclo-S<sub>5</sub>
* Cyclo-Hexasulfur, Cyclo-S<sub>6</sub>
* Cyclo-Heptasulfur, Cyclo-S<sub>7</sub>
* Cyclo-Octasulfur, Cyclo-S<sub>8</sub>
|-
|[[Selenium#Characteristics|Selenium]]
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* "Red selenium", cyclo-Se<sub>8</sub>
* Gray selenium, polymeric Se
* Black selenium, irregular polymeric rings up to 1000 atoms long
* Monoclinic selenium, dark red transparent crystals
|-
|[[Spin isomers of hydrogen]]
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* Orthohydrogen, H<sub>2</sub> with nuclear spins aligned parallel
* Parahydrogen, H<sub>2</sub> with nuclear spins aligned antiparallel
These nuclear spin isomers have sometimes been described as allotropes, notably by the committee which awarded the 1932 Nobel prize to [[Werner Heisenberg]] for quantum mechanics and singled out the "allotropic forms of hydrogen" as its most notable application.<ref>[https://www.nobelprize.org/nobel_prizes/physics/laureates/1932/heisenberg-facts.html Werner Heisenberg – Facts] Nobelprize.org</ref> 
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