Curie worked with his wife in isolating polonium and radium. Tobacco contains traces of thorium, polonium and uranium. Recent studies on radium, polonium, and uranium proved foundational to the study of Pu toxicity. In this way, they isolated polonium and radium. Elements such as thallium, lead, polonium, cadmium, and bismuth are discussed. Polonium and astatine are produced in minute quantities by irradiating bismuth. Alpha particles from the polonium caused the beryllium to emit neutrons. The inclusion of antimony, polonium, and astatine as metalloids has been questioned. All elements from polonium (element 84) onward are measurably radioactive. Five elements are less frequently so classified&colon; carbon, aluminium, selenium, polonium, and astatine. Alpha particles emitted by polonium ionize air molecules that neutralize charges on the nearby surfaces. The status of polonium and astatine is not settled. He became the first known victim of lethal polonium 210-induced acute radiation syndrome. The people were administered between of polonium to study its excretion. The two oxides PoO and PoO are the products of oxidation of polonium.