Which metal reacts most vigorously with water?

Which of the following metal reacts least vigorously with water?

Which of the following metal reacts vigorously with cold water?

Which of the following reacts most vigrously with water

Which of the following reacts most vigrously with water

Which of the following reacts most vigrously with water

Alkali metals can react with water to form hydroxides which are alkalies. Which of the following will react more vigorously with water? K, Ca, Na, Mg.