Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant & Hackh's Chemical Dictionary, 5th ed)
    

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Note on the occurrence of traces of the heavy metals in the sandstones of the Moray Firth basin / by Wm. Mackie.

Hope for the autism spectrum : a mother and son journey of insight and biomedical intervention / Sally Kirk ; foreword by Elizabeth Mumper ; graphics design by Allan Kirchhoff.

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Metals, Heavy

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Note on the occurrence of traces of the heavy metals in the sandstones of the Moray Firth basin / by Wm. Mackie.

Hope for the autism spectrum : a mother and son journey of insight and biomedical intervention / Sally Kirk ; foreword by Elizabeth Mumper ; graphics design by Allan Kirchhoff.