Biologist's Periodic Tables
A periodic table showing where biologically essential (green), essential trace (purple), toxic (red), radioactive (yellow) and of low but not zero biological impact (gray) elements are found. Only highly toxic elements are shown in red. Li (as Li+) is biologically active and is used as an antidepressant.
And a periodic table for biologists from Science Videos:
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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