Answer: niton

AnswerCrossword Clue
NITON

Radon, originally

NITON

Element that shines in dark.

NITON

Element now called radon.

NITON
Former name of radon.
NITON
Gaseous element
NITONRadioactive element
NITONInert gas
NITONRadon, formerly
NITONFormer name for radon
NITONFormer name of radon
NITONRadon formerly
NITONRadon once