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单词 θ68907
释义
the world > matter > chemistry > elements and compounds > metals > specific elements > einsteinium > [noun] (2)
E1955

Chemistry. In form E. Denoting the element einsteinium. Now disused.

einsteinium1955

An artifically produced radioactive element. Symbol Es. Atomic number 99. Atomic mass of isotope 253 (1967) 253·0847.

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