Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water.
两个氢原子和一个氧原子结合组成一个水分子。
A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
水分子由两个氢原子和一个氧原子构成。
An atom itself is a complete whole, with its electrons, protons and neutrons and other elements.
原子本身是个整体，含电子、质子、中子以及其他组成部分。
Graphene is a flat sheet of carbon just one atom thick—with the carbon atoms arranged in a honeycomb lattice.
石墨烯是一种只有单原子厚度的碳原子平面层——碳原子按蜂窝状晶格排列。
They take up a teeny bit, but when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass.
它们占据了非常小的一部分，但当我们考虑原子的构造的时候，不用考虑它们会占用很多的质量。
At some point you will cut the magnet so small that you will have cut down to the size of a single atom.
从某个方面看，(如果你一直切下去，)你会把磁体切到如此之小，小到只有一个单原子那么大。
That is to say in a given atom.
也就是说对于一个给定的原子。
It means how much a certain atom actually wants to get an electron.
它意味着某一个原子，有多希望得到一个电子。
When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino.
原子内的一个中子衰变后会产生一个质子、一个电子和一个中微子。
A number describing the size of a carbon atom would be meaningless in a society that had no notion of atoms or building blocks of that scale.
描绘一个碳原子大小的数字在没有原子概念或者对没有构建这样的数值范围比例的社会是一点用处也没有的。
When a nitrogen atom sits next to a vacant spot in the carbon crystal, the intruding element provides an extra electron that moves into the hole.
当氮原子与碳晶体中的空心点相邻时，氮元素会产生特定的电子，这些电子可以移动到那个空心点里。
Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states.
所以，在1967年，SI采用了一个更为精确的制定办法，该办法基于一个铯原子在两个能级之间跃迁时的辐射频率。
Even then, a single atom often behaves as a magnet, but always with both a North and South pole, and you can't cut it any finer.
即便是这时，一个单原子总是表现得像一个磁体，但它仍然有南北两极，而你已经不能再细分下去了。
The electron orbits a phosphorus atom embedded in the silicon lattice, shown in silver.
电子绕图中银色的硅晶格中的磷原子的轨道。
A tritium atom has two extra neutrons.
氚原子多了两个中子。
But the nitrogen in the air was replaced with a nitrogen atom with a different number of neutrons, called an isotope.
但是空气中的氮气中的氮原子却会被一个叫做同位素的有着不同数量中子的氮原子所替换。
But a magnesium atom would carry two electrons, so a battery storing a given amount of energy could be nearly halved in size and weight.
但镁原子每次可以携带两个电子，这样的话在储存相同能量时可以使电池的大小和重量减半。
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。
This highlights the main difference between a string and an atom.
这是字符串与原子值之间的主要区别。
So let's say, for example, in a hydrogen atom.
比如说，在氢原子里。
When you split a uranium 235 atom you will create what we call fission fragments.
当你们将铀235原子分离的时候,你会创造出我们称为裂变碎片的。
Zap a hydrogen atom and it will resonate at a particular rate: 1420 megahertz (MHz).
轰击氢原子可以与某一特定的频率产生共鸣: 1420兆赫。
Even molecules that differ by a single atom can vibrate quite differently.
即使只相差一个原子的分子也会有差别很大的振动。
In terms of where different atoms are in a molecule, if you have a hydrogen atom or a fluorine atom, you can pretty much guarantee they're always going to be terminal atoms.
对于不同原子在分子中的位置，如果你有一个氢原子或者一个氟原子，那你基本可以保证，它们总是最末端的原子。
As such, the only valid operation on an atom is a comparison.
因此，对于原子值，惟一合法的操作是比较。
This produces a "waveguide," which functions like a one-atom-thick fiber optic cable.
这就形成了一个“波导管”，就像一个单原子厚度的光纤电缆。
Finesse comes from the ability to analyse small quantities accurately. And the smallest possible quantity in chemistry is, of course, a single atom.
能够进行准确的微量分析才算得上精细，而化学意义上的最小量无疑就是单一的原子。
A heme (HEM) is a multi-atom, non-proteinaceous organic structure capable of positioning an iron (FE) ion in its center.
亚铁血红素 (HEM)是一个多原子、非蛋白质的有机结构，能够将一个铁 (FE)离子置于其中心。
But sometimes a cosmic ray will collide with a nitrogen atom, giving it an extra neutron.
但有时宇宙射线会撞击氮原子，赋予它一个额外的中子。
But sometimes a cosmic ray will collide with a nitrogen atom, giving it an extra neutron.
但有时宇宙射线会撞击氮原子，赋予它一个额外的中子。
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