Model of the Atom timeline
by Hunter Little
John Dalton Model Of the Atom - 1803
John Dalton pictures atoms as tiny, indestructible particles, with no internal structure.
J.J. Thompson model of the atom - 1897
J.J. Thompson, a british scientist, discovers the electron, leading to his "plum pudding" model. He pictures electrons embedded in a sphere of positive electric charge.
Hantaro Nagaoka model of the atom - 1904
Hantaro Nagaoka, a Japanese physicist, suggests that an atom has a central nucleus. Electrons move in orbits like the rings around saturn
Ernest Rutherford model of the atom - 1911
New Zealander Ernest Rutherford states that an atom has a dense, positively charged nucleus. Electrons move randomly in the space around the nucleus
Neils Bohr's model of the atom - 1913
In Neils Bohr's model, the electrons move in spherical orbits at fixed distances from the nucleus.
Louis de Broglie model of an atom - 1924
Frenchmen 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 Schrodinger's model of an atom - 1926
Erwin schrodinger develops mathematical equations to describe the motion of electrons in atoms. His work leads to the electron cloud model.
James Chadwick's model of an atom - 1932
James Chadwick, a british physicist, confirms the existence of neutrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons.