One of the chemical elements, a transparent gas, first actually obtained by Prof. Ramsay in 1895, its existence in the sun's atmosphere having…
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| 释义 | the world > matter > chemistry > elements and compounds > metals > noble gases > helium > [noun] (3) helium1872 One of the chemical elements, a transparent gas, first actually obtained by Prof. Ramsay in 1895, its existence in the sun's atmosphere having… Subcategories:— forms of (2) |
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