Atomic Structure 1.10 recall the relative mass and relative charge of a proton, neutron and electron

Relative mass and relative charge

Neutron: 

Relative charge: 0

Relative mass: 1

Proton:

Relative charge: +1

Relative mass: 1

Electron: 

Relative charge: -1

Relative mass: 1/1836

Nearly all the mass is concentrated in the nucleus.