(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.
📺 Word Example from TV Shows

♪ Of a RADIUM in a lead jar
The Big Bang Theory Season 12, Episode 23

Madam Curie's discovery of RADIUM
turned out to have great potential...
The Big Bang Theory Season 1, Episode 2

♪ Six times ten to the eighth
atoms of RADIUM ♪
The Big Bang Theory Season 12, Episode 23

bathed in the glow of their love
and the RADIUM
The Big Bang Theory Season 5, Episode 16

...this is Madame Curie killing herself
by discovering RADIUM.
The Big Bang Theory Season 6, Episode 4