Question

allotropes of sulphur?
allotropes of carbon?​

Answer 1

Allotropes of sulphur?

Sulphur: Allotropic Forms

• Rhombic Sulphur.
• Monoclinic Sulphur.
• Plastic Sulphur.
• Colloidal Sulphur.
• Milk of Sulphur.

Allotropes of carbon?

There are several allotropes of carbon. Allotropes of CarbonAllotropes of carbon: a) Diamond, b) Graphite, c) Lonsdaleite, d) C60 (Buckminsterfullerene or buckyball), e) C540, f) C70, g) Amorphous carbon, and h) single-walled carbon nanotube, or buckytube.

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Answer 2

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The element sulfur exists as many allotropes. In number of allotropes, sulfur is second only to carbon.[1] In addition to the allotropes, each allotrope often exists in polymorphs, delineated by Greek prefixes (α, β, etc.).

Furthermore, because elemental sulfur has been an item of commerce for centuries, its various forms are given traditional names. Early workers identified some forms that have later proved to be single or mixtures of allotropes. Some forms have been named for their appearance, e.g. "mother of pearl sulfur", or alternatively named for a chemist who was pre-eminent in identifying them, e.g. "Muthmann's sulfur I" or "Engel's sulfur".[2][3]

The most commonly encountered form of sulphur is the orthorhombic polymorph of S

8, which adopts a puckered ring – or "crown" – structure. Two other polymorphs are known, also with nearly identical molecular structures.[4] In addition to S8, sulfur rings of 6, 7, 9–15, 18 and 20 atoms are known.[5] At least five allotropes are uniquely formed at high pressures, two of which are metallic.[6]

The number of sulfur allotropes reflects the relatively strong S−S bond of 265 kJ/mol.[1] Furthermore, unlike most elements, the allotropes of sulfur can be manipulated in solutions of organic solvents and is amenable to analysis by HPLC.[7]

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