GROUP VIB

THE CHROMIUM SUBGROUP

forms compounds with
oxidation states of 2+, 3+ and 6+

form compounds in which they exhibit oxidation
states of 2+ through 6+.

For chromium the
most stable oxidation state is

form oxides of which those of higher molecular weight are acidic.

Cr+2

Cr+3

CrO4-2

Cr2O7-2

Source of chromium

 Trace element
 Glucose tolerance factor
 Increases insulin sensitivity

 Found in brown sugar & butter
 Salts are destructive to tissues

Chromium deficiency

Powerful oxidizing agent

 Essential trace element
 Cofactor of enzyme that are flavin dependent

 Use in nitrogen fixation involve in bacterial
fixing of atmospheric nitrogen
 MoO+FeSO4 (Mol-Iron®)

 Radioactive element
 Discovered by Becquerel
 Manufacture of atomic bombs

 Use in making special steel alloys,
 Filaments of electric lamps
 as the anti-cathode in X-ray tubes.