An antiproton is the anti-particle of the proton. It has the same mass as a proton, but has a charge of -1.60 x
10-19 C and is made of antimatter. Whenever matter
and antimatter come into contact they will annihilate
and convert 100% of their mass into energy. If 285
protons collided with an equal number of antiprotons,
the total energy released would be x10-7 J.

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grav forces affect all objects magnetic forces affect magnetic objects and electric currents

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.