There are three trons:
The proton, The electron And the neutron.
They come in trillions of combinations for everything.
Stuff is made of atoms and atoms are made of protons, electrons and neutrons.
Albert einstein proved that atoms were real. He proved it by doing elaborate math that almost perfectly matched his theory.
The proton is heavy and positively charged.
The neutron is exactly the same size as the proton but neutral.
The electron has almost no mass at all and has the same amount of charges as the proton.
Electricity used for things such as phones, lights, cameras and computers is made of electrons.