←B   C↑   ↓Si   N→

Kohlenstoff ∙ carbone ∙ carbonio ∙ carbono
group IV: RH₄, RO₂

• melting point: 3825°C (Sublimes)
• boiling point: 4827°C
• density: 3.51 g/cm³

⚒ minerals:
Graphite C
Calcite CaC=₃

The three main contributors to the committed effective dose [from global fallout] received by the world population are carbon-14 (70%), cesium-137 (13%) and strontium-90 (3%). — radioactivity.eu.com

☢ radioisotopes:
C-14 (T1/2=5700 a) cosmogenic, activation product