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What makes Fe a transition element when Zn isn't?
Transition elements have an incomplete d-orbital. Fe has 6 electrons in the d-orbital so is a transition element whereas Zn had a complete d-orbital with 10 electrons so isn't.
Electron Configuration of Cr and Cu
Precipitate Colours:
Co 2+ + 2OH - --> Co(OH)2
Fe 2+ + 2OH - --> Fe(OH)2
Fe 3+ + 3OH - --> Fe(OH)3
Colbalt Hydroxide: Blue Precipitate
Iron (II) Hydroxide: Green Precipitate (brown in air)
Iron (III) Hydroxide: Rusty Brown Precipiate
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