Topic Page: Carbon[Lat.,=charcoal], nonmetallic chemical element; symbol C; at. no. 6; interval in which at. wt. ranges 12.0096–12.0116; m.p. about 3,550degrees Celsius; graphite sublimes about 3,375degrees Celsius; b.p. 4,827degrees Celsius; sp. gr. 1.8–2.1 (amorphous), 1.9–2.3 (graphite), 3.15–3.53 (diamond); valence +2, +3, +4, or -4.