a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) 同义词：He, atomic number 2,
Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table.
例句与用法
1.
A fountain of helium spurt out of the tube . 有一股氦的喷泉从小管中喷出。
2.
Most big balloons are now filled with helium . 现在许多大气球中充的是氦气。
3.
Helium is a gas used in balloons . 氦是一种用于气球的气体。
4.
Helium was discovered on the sun . 氦是在太阳上发现的。
5.
Hydrogen might be depleted with some of it turning into helium . 氢可能被耗尽，一部分变为氦。
6.
One safety catch in his design is its helium coolant . 这次设计中采用的一个安全措施就是使用氦冷却剂。
7.
After hydrogen, the atom with the simplest structure is that of helium . 在氢元素之后，氦的原子结构最简单。
8.
The deuteron can fuse with another proton to make a helium 3 nucleus . 氘核可以和另一个质子聚合以生成一个氦3核。
9.
When helium is cooled to very low temperatures, it forms an astonishing liquid . 当氦冷却到很低温度时，它会形成一种奇妙的液体。
10.
The discovery also explains why helium is found in radioactive mineral deposits . 这个发现也解释了为什么在放射性矿渣中找到了氦。
您当前位置：