Carbon

Since water is a compound containing two hydrogen atoms, and one oxygen atom, therefore it is a chemical compound. Allotropes cannot exist in any compound form, rather they are elemental forms. So, water cannot be termed as an allotrope.

Allotropes are different forms of the same element. Different bonding arrangements between atoms result in different structures with different chemical and physical properties. Allotropes occur only with certain elements, in Groups 13 through 16 in the Periodic Table.

From Wikipedia, the free encyclopedia. Eight allotropes 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. This is a list of the allotropes of carbon.

There are two main allotropes of oxygen: A diatomic molecule made up of 2 oxygen atoms with the moelcular formula O2 commonly referred to as molecular oxygen or dioxygen. A triatomic molecule made up of 3 atoms of oxygen with the molecular formula O3 referred to as ozone.

Diamond

Diamond is probably the most well known carbon allotrope. The carbon atoms are arranged in a lattice, which is a variation of the face-centered cubic crystal structure. It has superlative physical qualities, most of which originate from the strong covalent bonding between its atoms.

Carbon is capable of forming many allotropes (structurally different forms of the same element) due to its valency. Well-known forms of carbon include diamond and graphite. Other unusual forms of carbon exist at very high temperatures or extreme pressures.

Amorphous form consists of coal and charcoal. Fullerene consists of a Buckyballs form. As carbon dioxide is not in the elemental state of carbon, it cannot form the allotrope of carbon.

Diamond, graphite and fullerenes (substances that include nanotubes and ‘buckyballs’ , such as buckminsterfullerene) are three allotropes of pure carbon.

Conclusions. To summarize, we have performed a theoretical analysis of the relative stabilities of the lowest-energy carbon allotropes occurring in nature: graphite (graphene), diamond and lonsdaleite.

Diamond as its made up of carbon, on burning, gives off Carbon dioxide, carbon monoxide, heat, and light energy. But it needs more oxygen and more heat for the combustion to occur.