Carbon

B   C   Si   N

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

⚒ 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

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