The most radioactive element is Polonium it is a natural-occurring element. Polonium releases a big amount of energy and it releases a whole bunch of alfa-particles and thats what makes it radioactive. It can also self-heat itself and its is very rare element. This element can glow blue and when it heats up it produces enough radiation to kill you. Polonium is very deadly and radioactive so if you ever become a scientist or anything that has to do with Polonium be careful!
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