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汉语拼音：yuán zǐ

组成单质和化合物分子的最小粒子。由带正电荷的原子核和在核外运动的与核电荷数相等的电子组成。在一般化学反应中原子核不发生变化。

1. 构成化学元素的最小粒子，也是物质进行化学反应的最基本的单位，由带正电的原子核和围绕原子核运动的电子组成。

   毛泽东 《在省市自治区党委书记会议上的讲话》：“一个原子分两部分，一部分叫原子核，一部分叫电子。”

• The force between a pair of helium atoms is so weak that helium does not solidify at all.

  一对氦原子之间的作用力微弱得使氦根本不能固化。

• Meanwhile, Japan's Nuclear and Industrial Safety Agency said the spent fuel at the No. 4 reactor appeared to be immersed in water.

  与此同时，日本原子力安全保安院（NuclearandIndustrialSafetyAgency）说，四号反应堆的乏燃料看来浸没在水中。

• When the crystals do not mesh properly, the occasional atom will jut out where it should not, creating a defect to which a phage can stick.

  但晶体之间若无法适当啮合，有些原子可能凸出到它原本不该出现的位置，从而成为可与病毒结合的缺陷处。

• There was a woodcutter who's about to pick his ax and chop a piece of wood, and the whole galaxy is one atom of that ax.

  有一个伐木工拿起他的斧子准备砍一块木头。他的斧子很大。整个宇宙不过是其中一粒原子。

• In terms of this school of thought, all objects in the physical universe are reducible to a certain number of atoms.

  在这个学派的术语里面，物质宇宙的所有物体都可以还原成许多数目的原子。

• The head of Iran's atomic energy agency says the country is ready to cooperate with other countries for its nuclear energy development.

  伊朗原子能机构负责人表示这个国家在核能源开发上正准备与其

• In the United States enough time, energy and money that could have been used to erect new cities, were spent to build atomic bombs.

  美国为着造原子弹所用去的时间，精力和金钱，足够建立好几个新的城市了。

• The burst of light is called a photon echo; and its observation proved we have full control over the quantum state of the atoms.

  辐射出的光被称为光子回波，它的观测表明我们对于原子的量子态进行了完全的控制。

• A fundamental rule which must be obeyed in placing two or more electrons in the orbits of an atom is the exclusion principle.

  当两个或更多电子进入原子中的轨道时，必须遵循的基本规律是不相容原理。