(1) Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium.

(2) Radon is present in the atmosphere because it is constantly being formed during the radioactive decay of uranium and radium .

(3) The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy.

(4) Initial autopsies showed high amounts of radium and cesium in four deer livers.

(5) All isotopes of radium are radioactive with radium - 226 being the most stable.