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2007年3月21日，我国公布了111号元素Rg的中文名称．该元素名称及所在周期是（ ）

Gaokao · Chemistry · previous-year question

  1. A.錀$\quad$第七周期
  2. B.镭$\quad$第七周期
  3. C.铼$\quad$第六周期
  4. D.氡$\quad$第六周期

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