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【Chemistry】化學：atom structure 原子結構
　
1. atom　[ˋætəm]　n. 原子
An atom is the smallest part of an element that can exist chemically.
　
2. nucleus　[ˋnjuklɪəs]　n. 原子核
　Nucleus is an exceedingly tiny region at the center of the atom.
　
3. electron　[ɪˋlɛktrɑn]　n. 電子
　An electron is a tiny particle that is smaller than an atom and has a negative electrical charge.
　
4. neutron　[ˋnjutrɑn]　n. 中子
　Neutron is a particle carrying no electric charge, with about the same mass as a proton, and forming part of the nucleus of an atom.
　
5. proton　[ˋprotɑn] 　n. 質子
　A proton carries a positive charge numerically equal to the charge of an electron.
　
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