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Q

PERIODIC TABLE KEY

THE MAJOR ELEMENTS of which soil is composed.

Elements occuring in minute quantities in plants and marine and
freshwater algae.

MAJOR NUTRIENTS in plant tissues and soils.

TRACE ELEMENTS necessary to metabolic iunctions in plants.
CATALYTIC ELEMENTS involved in metabolic function and hydro-
carbon processing.

MAJOR ELEMENTS necessary to metabolic function in animals.
TRACE ELEMENTS necessary to metabolic function in animals.
Elements critical or limiting to phytoplankton, aquatic organisms.
POlSONS; radioactive isotopes taken up by plants and animals e.g.,
Ftn222, I131, Cs187, Th232, U235, Pu239.

POISONS; metabolic poisons. elements ortheir compounds dangerous
to life forms.

Elements specifically concentrated by bacterial action, root

associates of plants. anaerobic bacteria. or thiobacilli.

STATES- Light blue: gas at room temperatures. Dark blue: liquid at
room temperatures.

Element‘s name.
Elements number.

  

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