Carbon
carbon is in both diamond and graphite along with countless other things like charcoal
Diamonds are very hard, and graphite is very soft.
Graphene is not likely to be put on the periodic table as it is a single layer of carbon arranged in a 2D structure. The periodic table typically includes elements, not specific structures or materials derived from those elements.
If YOU write in this area, your question goes to the "already answered" bucket- Besides its use as jewelry, Diamond is used where anything incredibly hard is needed. Diamond (dust) is used to make saw blades and drill bits that can cut through just about anything. Graphite, while also composed of carbon, has an entirely different crystal structure, and different uses. Graphite is used as an electrical contactor (a brush) in electrical motors. It makes a great dry lubricant for things like locks, and when mixed with clay, forms the "lead" for ordinary pencils.
Graphite is commonly used in pencils as the writing material. Charcoal, on the other hand, is typically used for drawing purposes due to its darker and more smudgy nature compared to graphite.
Both are made up of pure carbon. These two are alotrophs
graphite
The black non-metal you are referring to is carbon. It has three well-known allotropes: diamond, which has a crystalline structure and is extremely hard; graphite, which consists of layers of carbon atoms and is used in pencils and lubricants; and charcoal, a porous form of carbon made from the incomplete combustion of organic materials. Each allotrope exhibits distinct physical properties and uses, despite being composed of the same element.
Graphite is a smooth and precise drawing tool that allows for fine details and shading control. Charcoal, on the other hand, is more expressive and bold, creating darker and more textured marks. Graphite is erasable and smudge-resistant, while charcoal is smudgy and difficult to erase. Graphite is commonly used for detailed drawings, while charcoal is often used for expressive and dramatic sketches.
It is charcoal, and also possibly graphite.
Diamond and graphite are allot-ropes of each other. Diamond has a tetrahedral structure where as graphite has an hexagonal arrangement. Both are made of carbon atoms entirely. Diamond is used in jewelry etc. where as graphite is used as in batteries , lubricants etc.
The element is carbon. Two well-known forms of carbon are graphite and diamond. Graphite is used in pencils and as a lubricant due to its layered structure, while diamond is renowned for its hardness and brilliance, making it desirable for jewelry and cutting tools. Both forms illustrate carbon's versatility and ability to exist in different structural arrangements.