Concept:Diamond is an allotrope of carbon, meaning it is composed entirely of carbon atoms arranged in a specific crystal structure.
Explanation:Diamond is made up of only one element: carbon.
Each carbon atom in diamond is bonded to four other carbon atoms through strong covalent bonds.
This tetrahedral arrangement gives diamond its extreme hardness.
Diamond forms under high pressure and high temperature deep in the Earth's mantle.
Other forms of carbon, such as graphite, have different structures and properties.
Thus, the elemental composition of diamond is pure carbon, with no hydrogen, oxygen, or silicon.
Answer:Pure Carbon