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roentgenium
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roentgenium
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理学
放射性元素
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roentgenium
𬬭
人工放射性元素,元素符号Rg,原子序数111,半衰期最长的同位素的质量数282。属周期系ⅠB族。为纪念德国物理学家W.K.伦琴[注]而命名。曾被称为111号元素(unununium),符号Uuu。
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Safe Navigation at Sea for Non-propelled Ships Issued by the People's Republic of China
safe neighborhood
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safe net system
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safe operation of ships
safe period of even heading
safe production of fossil-fired power plant
safe production regulations of thermal power plant
safe refuge
safe reliability of flight control system
Saferite
safe shut down
safety
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