Search Result：atomic number 69
atomic number 69 
(TTS Sound)
(TTS Sound)Overview of noun atomic_number_69
The noun atomic number 69 has 1 sense
- thulium, Tm, atomic number 69 -- (a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime)