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====Ion Formation====
: [[Transition Metal]]s form [[Positive Ion|positive ions]] during [[Chemical Reaction|chemical reactions]].
: [[Transition Metal]]s can form several different [[charge]] [[ion]]s and these different [[charge]]s can determine the [[Physical Property|physical properties]] of the [[compound]]s they are in. Specifically this affects the [[colour]] of those [[compound]]s.
In [[compound]]s the [[charge]] of the [[Transition Metal]] [[ion]] is given in [[Roman Numeral]]s after the name of the [[metal]]
*Copper (II) Sulphate: +2 [[Ion]] of [[Copper]] giving the [[compound]] a blue colour.
*Manganese (II) Chloride: +2 [[Ion]] of [[Manganese]] giving the [[compound]] a pale pink colour.
*Iron (II) Sulphate: *2 [[Ion]] of [[Iron]] giving the [[compound]] a pale green colour.
*Iron (III) Sulphate: *3 [[Ion]] of [[Iron]] giving the [[compound]] a redish-brown colour.
: Gem stones with various colours (red rubies, green emeralds, blue sapphires) get their colour from the [[Transition Metal]] [[ion]]s they contain.
====Catalysts====