Discussion
The metal which reacts most violently with cold water is
Answer: D
Potassium reacts most violently with cold water.
Reactivity increases down Group 1 as the outer electron becomes easier to lose. Sodium melts into a ball and fizzes; potassium reacts fast enough that the hydrogen ignites with a lilac flame. Calcium reacts steadily and magnesium hardly at all with cold water.
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