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13 cards from this deck
Between Groups 2 and 3, in the middle
Cr, Mn, Fe, Co, Ni, Cu
Much higher density
Higher (except mercury)
Stronger and harder
Much less reactive
Coloured (Group 1: white/colourless)
Bright blue
Speed up reactions without being used up
Act as catalysts
Form more than one type of ion
Fe2+Fe^{2+}Fe2+ and Fe3+Fe^{3+}Fe3+
Balance total positive and negative charges
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