Electrons

• Each atom is negatively or positively charged according to the addition or subtraction of electrons. 李贝. 西洋科学史.
• Wherever, as in the vacuum tube, these electrons appear, the presence of positively charged particles can also be demonstrated. 李贝. 西洋科学史.
• The surrounding electrons render the atom electrically neutral. 李贝. 西洋科学史.

拜伦整理