atomic number 90
参考词典中atomic number 90的常规释义：
英英解释
1个名词解释
- 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
[同] atomic number 90, th, thorium
点击查看……- 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
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