This paper analyzes shell electron pair repulsion theory , valence-bond theory and molecular orbital theory on molecular structure of noble gas compounds.

对稀有气体化合物的分子结构分别用“价层电子对互斥理论”、“价键理论”和“分子轨道理论”进行了分析处理。

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One is gas hydrates—white, sorbet-like compounds that usually consist of methane molecules trapped in a cage of water.

一个是气体水合物，这是一种白色的、类似果汁冰糕的混合物，通常由嵌入笼形水结构的甲烷组成。

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In all of the known chemical compounds of the noble gases, the noble-gas atom has a net positive charge.

在为人所知的所有稀有气体化合物中，稀有气体原子具有净正电荷。

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Burning diesel versus gas results in higher levels of nitrogen compounds and soot, both of which can be very harmful to human health.

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Preventing leaks also cuts back on other air pollutants associated with gas production and use, including such volatile organic compounds as ethane and butane.

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The rule of 70 is a shortcut to estimate how many years it will take to double something that compounds at a steady growth rate (say money, or demand for natural gas).

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