A helium atom weighs less than the four original hydrogen atoms.
一个氦原子的重量不到四个原始氢原子。
A system of metastable helium atom beam source has been developed.
研究设计了一种亚稳态氦原子束源系统。
Upon gaining two electrons the alpha particle becomes a helium atom.
粒子获得两个电子之后就变成了氦原子。
To assign more than three degrees of freedom to a helium atom would lead to incorrect predictions.
认为氦原子具有三个以上的自由度，将会导致错误的论断。
So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.
所以我们来对屏蔽举两个例子，如果我们在讨论氦，举例来说一个氦原子核或者氦原子。
Because protons and neutrons have roughly the same mass (and electrons have almost no mass), the helium atom should have about four times the mass of the hydrogen atom.
由于质子与中子的质量大约相等(并且电子几乎没有质量)，氦原子的质量大约应是氢原子质量的四倍。
When we plug it into equations we just use the number, e So, let's think of what we could have if we have two electrons in a helium atom that are shielded in two extreme ways.
当我们将它带入方程时我们,只用它的数字，在那里是假定的。，the，e，is，assumed，there。,所以我们来想想如果在一个氦原子中,有两个以两种极端形式被屏蔽的电子,我们会得到什么。
Electron-electron correlation in the doubly excited states of the helium atom has been investigated by partial wave analysis, thereby the geometric character of relevant states has been revealed.
本文从分波分析入手，研究了氦原子诸双激发态内电子间的角关联，进而显示了这些态的几何特征。找出了K—量子数不同的态在分波结构上的差异，从而为K—分类规则提供了可靠的物理依据。
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。
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。
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