Potassium = Violent reaction with water. Explosive in acid, Sodium = Rapid reaction in water. Explosive in acid, Lithium = Quick reaction in water. Violent reaction in acid, Calcium = Steady reaction in water. Rapid reaction in acid, Magnesium = Very slow reaction in water. Quick reaction in acid, Zinc = No reaction in water. Steady reaction in acid, Iron = No reaction in water. Slow reaction in acid, Copper = No reaction in water. No reaction in acid.

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