atomic number 69   (TTS Sound)

The atomic_number_69 has 1 Senses.

• atomic number 69, thulium, tm
• ツリウム
• 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
• 柔らかで銀色の希土類金属元素