Periodic Table of Biologically Active Elements

6 C 23%

Carbon (Z = 6)

Standard Mass: 12.011 Da Biological Category: Major Bulk Element Body Abundance: 23.000% (16,100 g) Internal Decays: 241,500 / min (¹⁴C)

KEGG Database ↗ WebElements Biol ↗

Biological Abundance of Elements in Reference Human Organism

Dataset Source: ElementsOfLife.xls

Symbol	Element Name	Atomic Number (Z)	Atomic Weight (Da)	Weight Fraction (%)	Computed Mass (g)	KEGG Identifier
TOTAL INVENTORY SUM (Σ):				99.826%	69,878 g

Radioactive Decay of Elements Present In Biological Systems

Aggregate Human Baseline: ~426,349 Decays / min (~7,106 Bq)

Estimated Body Cells (B): 1.0 × 10¹⁴ cells

Reference Body Mass: 70,000 g (70.0 kg)

Avogadro's Constant (Nₐ): 6.022 × 10²³ mol⁻¹

Isotope	Parent	Isotopic Abundance	Half-Life (t½)	Mode	Reference	Grams / Body	Atoms / Body	Decays / Year	Decays / Minute
¹⁴C	Carbon	Cosmogenic	5,730 yr	β⁻	Australia	—	—	1.27 × 10¹¹	241,500
³H	Hydrogen	1.00 × 10⁻¹⁷	12.43 yr	β⁻	Ottawa	7.00 × 10⁻¹⁴	1.41 × 10¹⁰	565,312,416	1,075
⁴⁸Ca	Calcium	0.187%	6.00 × 10¹⁸ yr	2β⁻	Tokai	1.8326	2.30 × 10²²	1,916	0
⁴⁰K	Potassium	0.0117%	1.28 × 10⁹ yr	β⁻ / EC	Tokai	0.0164	2.47 × 10²⁰	9.67 × 10¹⁰	183,774
TOTAL INTERNAL BIOLOGICAL DECAY RATE (Σ):								2.24 × 10¹¹ / yr	426,349 / min

Group Period	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
1
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7

* Lanthanides			*
** Actinides			**