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小宝:牛老师,2009年有在化学史上具有划时代意义的大事吗?挑一个我能懂得的说一说好吗?牛老师:好的。2009年10月传出一个消息,合成了第117号元素,从此,元素周期表里的所有空格全填满
Xiao Bao: Niu teacher, in 2009 there is epoch-making event in the history of chemistry it? Pick one I can understand to say it alright? Cattle teacher: Okay. A message came out in October 2009 that synthesized Element 117, and since then all the spaces in the Periodic Table have been filled