電子
電子，成原子之物也，質重一點六七三乘以十之負廿七次方公斤。其荷陰，合負一點六零二乘以十之負十九次方庫侖耳。蓋費米子之屬，自旋半正，乃基本粒子之屬。
原子者，質子、中子成核，遂成原子核，電子繞核而行耳。原子之電子僅一層者，以二為安；有數層者，最外達八為安。原子初為中性，因其趨安，原子遂效，電子或得失，或共用。
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