This element is a noble gas. Where is it located in the periodic table? A. In group 18 B. In group 17 C. In group 16 D. In group 15 相关知识点: 试题来源: 解析 A。稀有气体在周期表中的第十八族。第十八族元素为稀有气体,化学性质非常稳定。
A Noble Gas Surprise: Helium Can Form Weird CompoundsClara Moskowitz
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The many-body terms also play an important role in determining the detailed structures. The size dependence of the calculated thermochemical parameters are consistent with the reported mass spectral pattern which shows the first sequence of the magic number at n = 6 and 8. 展开 ...
What was the argument used by Bartlett that led him to the first synthesis of a noble-gas compound? Explain why the exact size of an atom is difficult to determine. Why isn't hydrogen iodide hydrogen monoiodide? Briefly describe, why do elements in a given group have similar chemical prope...
(A)Argon (B)Helium, Exists as mono-atomic molecules and are held together by weak van der Waal's forces.These van der Waal's forces increase with the increase in atomic size of the atom, and therefore, the boiling points increases from He to Rn.Hence H
Most of the vertical structure develops by 150–200 Ka; after this period, growth is primarily lateral, resulting in the connection of individual water chambers. Full size image Tools and datasets We conducted our morphologic mapping using Esri's ArcGIS Desktop 10.3 (http://www.esri.com/...
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