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放射性元素
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seaborgium
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人工放射性元素,元素符号Sg,原子序数106,半衰期最长的同位素的质量数271。属周期系ⅥB族。以著名化学家G.T.西博格[注]的名字而命名。
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category of Abelian groups
category of a closed subset
category of algebras
category of a set
category of automata
category of biosafety and biosecurity
category of categories
category of diagrams
category of erysipelas
category of functions
category of functors
category of groups
category of homomorphisms
category of mappings
category of mobilizing manipulations
category of modules
category of morphisms
category of relations
category of rings
category of R-modules
category of sets
category of spaces
category of squeezing-pressing manipulation
category of topological spaces
category product
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