氦是最轻的稀有气体。

Helium is the lightest rare gas.

六种稀有气体在元素周期表的最右侧。

The six noble gases are found in the far right column of the periodic table.

较重的稀有气体具有较低的电离势，这也可以解释它们的化学性质。

The low ionization potentials of the heavier gases also account for their chemistry.

在稀有气体一阶电离势的基础上，科塞尔注意到：氙最可能形成氟化物和氧化物。

On the basis of the first ionization potentials of the gases, Kossel noted that xenon was most likely to have the capability of forming fluorides and oxides.

还兼营液氧、液氮、液氩、乙炔气、二氧化碳、氢气、丙烷气、氟里昂、液氨及其他高纯和稀有气体。

It also supplies liquid oxygen, liquid nitrogen, acetylene, carbon dioxide, hydrogen, propane, freon, liquid ammonia, and rare element gas.