Since some atoms can lose electrons and other atoms can gain electrons, it is possible to cause a transfer of electrons from one object to another. When this takes place, the equal distribution of the positive and negative charges in each object no longer exists. Therefore, one object will contain an excess number of electrons and its charge must have a negative, or minus (-), electric polarity. The other object will contain an excess number of protons and its charge must have a positive, or plus (+), polarity.

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