The reactivity series shows metals in order of reactivity. The reactivity of a metal is related to its tendency to form positive ions. Iron and aluminium are extracted from their ores in various ways.

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Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan, and Nano Ceramics ...

Can be used to recap on tritation or could lead into a classroom discussion on chemical changes and structures.