John Dalton pictures atoms as tiny. indestructible particles , with no internal structure
In niels bohrs model the electrons move in electrons move in spherical orbits at fixed distances from the nucleus
J.J Thomson a British scientist , discovers the electron leading to his plum pudding model. He pictures electrons embedded in a sphere of positive electric charge
Han taro Nagasaki , a Japanese physicist , suggest that an atom has central nucleus electrons move in orbits like the rings around Saturn
New Zealander Ernest Rutherford states that an atom has a dense positively charged nucleus electrons move randomly in the space around the nucleus
Frenchman Louis de Broglie proposes that moving particles like electrons have some properties of waves. Within a few years, evidence is collected to support this idea.
Erwin Schodinger develops mathematical equations to describe the motion of electrons in atoms. His work leads to the electron cloud model.
james chadwick a British physicist confirms the existence of neutrons which have no charge atomic nuclei contain neutrons and positively charged protons