[請益] TPO 16 Development of the Periodic

看板TOEFL_iBT (TOEFL_iBT托福)作者peter3752001 (陽光啦啦佑)時間14年前 (2011/10/19 16:23)推噓1(1推 0噓 3→)

留言4則, 2人參與討論串1/1

想請教這篇閱讀的最後一題 The structure of the periodic table appeared to limit the number of possible elements. It was therefore quite surprising when John William Strut (Lord Rayleigh, discovered a gaseous element in 1894 that did not fit into the previous classification scheme. A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen and nitrogen are removed from air, but its importance had not been realized. Together with William Ramsay, Rayleigh isolated the gas (separating it from other substances into its pure state) and named it argon. Ramsay then studied a gas that was present in natural gas deposits and discovered that it was helium, an element whose presence in the Sun had been noted earlier in the spectrum of sunlight but that had not previously been known on Earth. Rayleigh and Ramsay postulated the existence of a new group of elements, and in 1898 other members of the series (neon, krypton, and xenon) were isolated. Answer Choices ○ Lord Rayleigh provided evidence that the structure of the I—Ramsay and Lord Rayleigh challenged the importance of the periodic table limited the potential number of elements. ○ Chemical research that Henry Cavendish had done a centuryearlier. ○ Isotopes of a given element have exactly the same physical properties, but their chemical properties are slightly different. ○ Mendeleyev and Meyer organized the known elements into a F chart that revealed periodic recurrences of chemical and physical properties. ○ Mendeleyev's successful prediction of the properties of then- r unknown elements lent support to the acceptance of the periodic law. ○In the 1890's, Ramsay and Lord Rayleigh isolated argon and proposed the existence of a new series of elements. 答案是4,5,6 我選1,4,5 因為我覺得1的選項就在段落的第一句啊? 而且第六的選項，應該是發現argon & helium之後才提出假說的吧? 還是答案錯了呢請版大們指教！謝謝QQ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.42.90.75