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汉语拼音：diàn zǐ céng

在多电子的原子中，根据电子所具有的能量差异和运动区域离核远近不同，而将核外电子分成不同的能层。按电子能量由低到高，运动区域离核由近及远称为第1、2、3、4等电子层，或分别用k、l、m、n等表示。

• We discovered that the concentration of energy in the nucleus of the atom is 2 million times as great as energy in the shell of an atom.

  我们发现原子核中浓缩的能量是原子电子层能量的2百万倍。

• Metal ion has effects on the surrounding molecules depends on its radius, the charge and the structure of electron shell.

  金属离子对周围分子的作用主要取决于其半径、电荷和及电子层结构。

• If all the shells containing electrons are completely filled, the effects cancel out and each atom has a resultant zero magnetic moment.

  如果有的电子层上均排满电子，则作用力互相抵消，而导致每个电子的磁矩为零。

• This US map comes with 100 LED pins; push them into the map's foamy surface to make contact with the electrical layers below.

  这张美国地图带有100个LED图钉；将他们按入地图的泡沫表面，就能与下面的电子层接通。

• The reason to suspect it might not is that as the shells get bigger, the velocity of the electrons within them increases.

  有人怀疑可能并不适用，原因在于当电子层增大时，层内电子运动速度也加快。

• Halogen atoms contain seven electrons in their valence shell.

  卤原子在它们的介电子层含有七个电子。

• Some layers between the third and last layers of an atom contain as many as 32 electrons.

  原子内第三层和最外层之间的一些电子层，含有多达32个电子。

• The electron structure of transition elements is permanentlydiffcult point of teaching.

  过渡元素原子电子层结构是长期困扰教学过程的难点。

• The periodic table works because the electrons like to organise themselves in concentric shells.

  元素周期表之所以可行，是因为电子往往要在同心电子层中自行排列。