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单词 θ68869
释义
the world > matter > chemistry > elements and compounds > metals > specific elements > radium > [noun] (2)
radium1899

Chemistry. A radioactive, soft, metallic chemical element, atomic number 88, which is a member of the group of the alkaline earth metals and occurs…

Subcategories:

— used as a radiation source in teletherapy (1)
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更新时间:2025/2/24 10:35:01