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No best answer has yet been selected by Absinth. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.what, potassium metal ?
You're joking! Very reactive, soft metallic, burns explosively in water with a pink flame (quite pretty really as you go up in smoke)
something like Pot chloride ? You could buy it in the shops as a salt substitute but read the label
Oh and by the way - if you are on a low sodium diet and someone has said K is all right as a substitute - then discuss it with your doctor.