How do you know if a particle is an electron/proton?

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To determine if a particle is an electron or a proton, one must measure its charge or mass. Protons possess a positive charge and are heavier than electrons, which have a negative charge. The behavior of these particles in electric and magnetic fields can also provide definitive identification; protons move in the direction of electric field lines, while electrons move in the opposite direction. The right-hand rule is applicable for analyzing their motion in magnetic fields.

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im sure its a simple question but i don't know thanks
 
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If you know it's either a proton or an electron (but no other kind of particle), then all you need to do is measure its charge, or its mass.

- Warren
 
Hmm.. as a real life experiment?

Magnetic fields and electric fields can do this very easily.

If you apply an electric field, a proton will go in the direction of electric field lines, and an electron will go the reverse.

Magnetic fields: right hand rule.

Otherwise, chroot is right. Electrons have negative charge. Protons have positive. A proton weighs more than an electron.
 

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