Charge in the electrons and protons

[benzun_1999]

dear reader,
the electrons are negative and protons are positive was proved by jj thompson. he proved it using the discharge tube. the cathode rays which started from the cathode(-) to the anode(+) was said to be negative because of its attraction to the anode. is there any other experiment or theory that proves that electrons are negative and protons are positive?. i am only in 9th std, so please don't be angry with me for this question.

 

[benzun_1999]

thanks

thanks mmwave. i fell that electrons can also be positive provided that the protons are positive. i get it clear now , they are just opposite charges.