What does it mean that an electron has a negative charge?

[Moris526]

Hi.
What is a ¨charge¨ ? What does it mean that an electron has a negative charge?

What is modified in particle when it changes charge, if posible.?

When two charges atract , is one that pulls the other or both pull each other?

thanks

 

[Defennder]

A charge is just a fundamental physical property. It's hard to explain it here, you might want to read this:
http://en.wikipedia.org/wiki/Electric_charge

On whether it's possible to change, for example the charge of an electron from - to +, I have to say I do not know for sure, but it does not appear possible.

On the other hand, if by "particle" you are not referring to the fundamental unit of charge (the electron) but some body, then the charge on that body may be changed by adding or removing electrons. But it appears that your question is more likely the former.

Attraction and repulsion of charges is mutual. Both charges experience the force.