helium

[化学] 氦（符号为He，2号元素）英释中释na gas that is lighter than air and is used to make balloons float. It is a chemical element ：symbol He

1 liquid helium,液氦；液态氦

2 helium gas,氦气

1 We have a helium nucleus and one electron..我们有一个氦核和一个电子。

2 If helium loses on electron, what do we have?.如果氦原子失去了一个电子，我们得到了什么？