Carbon 6 C 12.011(8) Carbon is used in pencils. Properties Symbol Name Atomic Number Atomic Weight Group Number C carbon 6 12.011(8) 14 Description Standard State: solid at 298 K Color: graphite is black, diamond is colorless Carbon is found in abundance in suns, stars, comets, and atmospheres of most planets.   Carbon is found free in nature.  Without carbon, life would cease to exist.