MODEL OF AN ATOM TIMELINE
Antonio Rodriguez
Summary
John Dalton pictures atoms as as tiny, indestructible particles, with no internal structure
Summary
J. J. Thomson, a British scienist, discovers the electron, leading to his "plum pudding" model. He pictures electrons embedded in a sphere of positive electric charge
Summary
Hantaro Nagaoka, a Japanese physicist, suggests that an atom has a central nucleus. Electrons move in orbits like the rings around Saturn
Summary
Ernest Rutherford states that an atom has a dense, positively charged nucleus. Electrons move randomly in the space around the nucleus.
Summary
Niels Bohr's model, the electrons move in spherical orbits at fixed distances from the nucleus
Summary
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
Summary
Erwin Shrodinger develops mathematical equations to describe the motion of electrons in atoms. His work leads to the electron cloud model.
Summary
James Chadwick confirms the existence of neutrons,which have no change Atomic nuclie contain neutrons and positively charged protons.