[請益] 黃金閱讀 Development of the periodic table

看板TOEFL_iBT (TOEFL_iBT托福)作者sa018858 (情定醫踢希..)時間15年前 (2010/12/13 17:38)推噓2(2推 0噓 5→)

留言7則, 2人參與討論串1/1

今天下午練習了這一篇整整錯了八題, 用字典查過, 還是看不大懂他在說什麼於是找了一些資料, 提供給對這篇茫然的板友 http://en.wikipedia.org/wiki/Periodic_table 這是週期表的介紹, 我想很多人都已經將它還給老師了, 複習一下應該會比較了解內容其中也有提到gallium與germanium的部分, 讓我有一點點概念回神了.. 只是, 下面依然有兩題比較疑惑的, 希望高手同學能幫我解答解答.. -------------------------------------------------------------- 第三段: Mendeleyev went further than Meyer in another respect: he predicted the properties of six elements yet to be discovered. For example, a gap just below aluminum suggested a new element would be found with properties analogous to those of aluminum. Mendeleyev designated this element "eka-aluminum" and predicted its properties. Just five years later an element with the proper atomic mass was isolated and named gallium by its discoverer. The close correspondence between the observed properties of gallium and Mendeleyev's predictions for eka-aluminum lent strong support to the periodic law. Additional support came in 1885 when eka-silicon, which had also been described in advance by Mendeleyev, was discovered and named germanium. 9. Paragraph 3 suggests that Mendeleyev predicted the properties of eka-aluminum on the basis of 1. the atomic mass of alumnium (我認為) 2. the position of the gap in the periodic table that eka-alumnium was predicted to fill(正解) 3. the similarity of eka-aluminum to the other five missing elements 4. observation of the properties of gallium 10. It can be inffered from paragraph 3 that tht significance of the discovery of gallium was that it supported which of the following? 1. the idea that aluminum was correctly placed in the periodic table(哪邊錯?) 2. Mendeleyev's prediction that eka-silicon would be discovered next 3. the organizing principle of the periodic table(正解) 4. the idea that unknown elements existed. 最後謝謝monizuka大大的回應.. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 112.104.179.124