Chemistry International
Vol. 23, No. 6
November 2001
"Heavy
Metals"- A Meaningless Term
[Back
to text]
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)
[Back
to text]