two basic properties of electric charges
Additivity of charges 
Quantisation of charges 

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Additivity of charges – If a system contain two point charges q1 and q2, the total charge of the system is obtained simply by adding algebrically the two charges q1 and q2.

Charge is conserved – When a body is charged by external means,there is transfer of electrons from one body to another but no new charges are created or destroyed.