atomic number 90   (TTS Sound)

The atomic_number_90 has 1 Senses.

• thorium, atomic number 90, th
• トリウム
• a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
• 柔らかで銀白色の4価の放射性金属元素