the metal that exhibits more than one valence number is?

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the metal that exhibits more than one valence number is?

sodium
potassium
calcium
iron

2007-10-04 04:33:07 · 2 answers · asked by tia 3 in Science & Mathematics ➔ Chemistry

2 answers

Iron can be 2+ (ferrous) or 3+ (ferric).

2007-10-04 04:36:21 · answer #1 · answered by RolloverResistance 5 · 0⤊ 0⤋

Iron--Group 1 and 2 metals (sodium, potassium and calcium) always form ions of a specific charge. Transition metals often (but not always) can form a variety of ions with different charges.

2007-10-04 11:36:30 · answer #2 · answered by hcbiochem 7 · 0⤊ 0⤋