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Fe²+
iron (II)
Ni²+
nickel (II)
Cr²+
chromium (II)
Co²+
cobalt (II)
Mn²+
maganese (II)
Fe³+
iron (III)
Ni³+
nickel (III)
Cr³+
Chromium (III)
Co³+
Cobalt (III)
Mn³+
Manganese (III)