Napisz wartościowość podanych niżej pierwiastków:
Fe, Cu, Zn, Cr, Mn, Ni, Au, Ag, Hg.
Fe, Cu, Zn, Cr, Mn, Ni, Au, Ag, Hg.
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Cu = I i II
Zn = II
Cr = II i III
Mn = II, III, IV, VI, VI
Ni = II i III
Au = I, III
Ag = I
Hg = I i II