The structure of atoms:
Atoms are made of three smaller subatomic particles called, protons, neutrons and electrons.
Proton: charge= +1: mass=1
Neutron: charge= 0 (neutral): mass=1
Electron: charge= -1: mass= nearly 0.
At the centre of an atom is a tiny nucleus, the protons and neutrons are in here, so this is were most of the mass is. The electronsmove around the nucleus occupying energy levels.
Different atoms have different masses because they…