Atomic Structure
Proton-
A proton is the one out the two subatomic particles in the nucleus. It has a positive charge, and the amount in the element is the same as the number of electrons. The number of protons in the element also equals its atomic number.
Neutron-
A neutron is the second subatomic particle in the nucleus. It has a no charge and its what keeps all the particles in the nucleus where it also resides. The number of protons plus the number of neutrons in the element equals the atomic mass.
Electron-
An electron is different from the other subatomic particles. Instead of being inside the nucleus like protons and neutrons, it is outside of it in a place called the electron cloud. It revolves around the nucleus inside of the cloud. The number of electrons in an element is the same as the number of protons, but it has a negative charge so it's not the exact same as a proton.