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Atoms & Molecules - Life requires about 25 chemical elements

  • naturally occurring elements

  • 92 naturally occurring

  • man-made elements

  • additional 12 - 17 man-made elements

Atoms & Molecules - Life requires about 25 chemical elements

  • distribution of elements (non-living vs. living)

  • in crust of earth (non-living)

    • 9 elements constitute ~99% (by mass) of earth’s crust

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Atoms & Molecules - Life requires about 25 chemical elements

  • distribution of elements (non-living vs. living)

    • in living organisms

      • of 92 naturally occurring elements

        • ~ 25 are essential to life

          • »

            14 of which are found in organisms in any more than trace (>0.01%) amounts

          • »

            trace elements

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Atoms & Molecules - Life requires about 25 chemical elements

  • of 25 elements essential to life

    • 11 are found in > than trace amounts

      • 4 make up ~96% of human body

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