Element #6 is Carbon, which is a chemical element with the symbol C and atomic number 6. It is the sixth most abundant element in the universe and makes up about 0.2% of the Earth's crust. Carbon is an essential element for all known forms of life and is found in many organic compounds. It is also a major component of coal, petroleum, and natural gas. Carbon is a non-metallic element and is considered to be a semi-metal due to its ability to form covalent bonds with other elements. Carbon is a versatile element and can form a variety of compounds, including diamond and graphite.