Chemistry International
Vol. 23, No. 6
November 2001

 

"Heavy Metals"- A Meaningless Term

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Caption Periodic table of the elements showing those metals classified as Class A - hard metals (purple), Class B - soft metals (yellow), and borderline - intermediate metals (green).
N.B: Copper and lead may be either Class B or bordeline, depending on wheter it is Cu(I) or Cu(II), and Pb(II) or Pb(IV) respectively. Iron may be either Class A or borderline, depending on wheter it is Fe (III) or Fe(II).

(Please note that this table and caption were revised after publication of the corresponding hard copy reference)

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