atom

英 [ˈætəm]

美 [ˈætəm]

n.  原子

复数：atoms　

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Oxford 3000 / Collins.2 / BNC.4241 / COCA.5184

牛津词典

noun

• 原子
  the smallest part of a chemical element that can take part in a chemical reaction
  1. the splitting of the atom
     原子的分裂
  2. 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。

柯林斯词典

• N-COUNT 原子
  Anatomis the smallest amount of a substance that can take part in a chemical reaction.
  1. A methane molecule is composed of one carbon atom attached to four hydrogens.
     甲烷分子由1个碳原子与4个氢原子构成。

英英释义

noun

• (nontechnical usage) a tiny piece of anything
  Synonym:moleculeparticlecorpusclemotespeck
• (physics and chemistry) the smallest component of an element having the chemical properties of the element

双语例句

• Neutrons and protons are bound together in the nucleus of an atom.
  在原子核里，中子和质子是结合在一起的。
• So, which atom is in need of those lone pair electrons?
  那么，哪个原子需要这对孤对电子呢？
• Each of the four valency electrons of the carbon atom is shared with one of a hydrogen atom.
  碳原子的四个价电子都各与氢原子的一个价电子共用。
• In this model the arrangement of bonds around the central atom is considered to depend upon how many valence-shell electron pairs.
  在这个模型中，认为围绕中心原子的化学键的排列取决于价层中电子对的数量。
• The compact core of the atom begins to appear.
  紧凑的原子内核现身了。
• An atom itself is a complete whole, with its electrons, protons and neutrons and other elements
  一个原子本身就是一个完整的整体，包括电子、质子、中子及其他元素。
• The anion OH having one oxygen and one hydrogen atom.
  含一个氧原子和一个氢原子的OH负离子。
• And ion, which is an atom or group of atoms with an electrical charge.
  和离子，它是一个原子或原子的电荷组。
• A methane molecule is composed of one carbon atom attached to four hydrogens.
  甲烷分子由1个碳原子与4个氢原子构成。
• A proton or a neutron has about the same mass as a hydrogen atom.
  质子或中子的质量和氢原子的质量大致相同。