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Polonium and Radium .
Radium and polonium are principally alpha emitters.
Polonium and radium are radioactive elements and toxic; they are dangerous.
The radium and polonium elements were and still are radioactive elements.
Any link between Dalton and polonium&radium.
Radium and polonium are radioactive natural chemical elements.
Polonium and radium doesn't affect history.
Radium and polonium doesn't changed the world.
Polonium and Radium .
Radium and polonium are principally alpha emitters.
Polonium and radium are radioactive elements and toxic; they are dangerous.
Yes, radium and polonium are radioactive elements.
The radium and polonium elements were and still are radioactive elements.
Both radium and polonium are radioactive elements and are not stable.
Polonium (Po) and radium (Ra) are two different chemical elements.
Polonium and radium are radioactive chemical elements but they have not the same properties.
Polonium and radium are natural chemical elements, metals, solid, very radioactive.