• Trace Element

    - metal, toxic essential trace element; fluorine, F, fluoride ion, F− (3 - 4 mg) - a...

  • Fluorine

    Fluorine, F, fluoride ion, F− (3 - 4 mg) - a beneficial poisonous element, essential...

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Lena Nechet, artist - Fine art, media productions, language.
San Diego, California , USA, LenaNechet.com
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