chemical element
element
plutonium 239
aluminium
antimatter
atomic
beryllium
botulism
cobalt
contaminant
deuterium
fertilizer
fission
fluorine
gaseous
helium
hydrogen
isotope
neptunium
olivium
potassium
radioactive
radium
tetryl
thorium
tritium
tungsten
uranium
ammonium
harmonium
pandemonium
polonium
zirconium