Answer: RADIUM

AnswerCrossword Clue
RADIUMDiscovery of 1898.
radiumradioactive metallic element
RADIUMSubject of Marie Curie's isolation
RADIUMElement discovered by Marie and Pierre Curie
RADIUM1898 chemistry discovery
RADIUMBygone component in luminous paint
RADIUMAlpha particle emitter
RADIUMDiscovery of 1898
RADIUMCuries' find
RADIUMCurie's discovery
RADIUMDecaying metal
RADIUMAtomic Number 88.
RADIUM1898 discovery.
RADIUMProduct of pitchblende.
RADIUMMetallic element discovered in 1902.
RADIUMElement discovered in 1898
RADIUMCurie discovery
RADIUMCuries' discovery
RADIUMElement discovered by the Curies