Chris Wagner's atomic theory timeline

Democtrus

500

Existed in 5ooB.C.
he used discourse
there are no limit to the amount of times a atom could be split

Aristotle

500

100 B.C.
He did not think there was a limit to the number of times a substance could be divided.
He used discource.

Isaac Newton

Jan 1, 1704

All change is caused by the collisions of atoms

John Dalton

Oct 31, 1766

All matter is made up ofindivisual particles called atoms, which cannot be divided.
He measured the mass of elements

J.J. Thomson

Oct 31, 1856

Atoms are made of even smaller particles
He used a sealed glass tube a metal disk at each end and wire connecting the disks to a source of electricity.

Ernest Rutherford

Aug 30, 1899

All of an atoms positive charge is centered in its nucleus. He did a gold foil experiment where he used a beam of alpha partilces and gold foil to delfect the beam.

Hantaro Nagaoka

Oct 31, 1904

He suggests that an atom has a central sore called a nucleus. Electrons move in orbits like the rings of Saturn

Neils Bohr

Jun 28, 1911

he discovered a eletron in an atom can go from one energy level to another when the atom gains or loses energy.

Henry Gwyn Jeffery Moseley

Jan 3, 1914

Discovered that the elements atomic number is related to its X-Ray length.

Louis De broglie

Oct 31, 1924

He suggests that moving particles like electrons have some properities of waves

Erwin Schodinger

Oct 31, 1926

He used mathmatical Equations to describe the motion of particles. His work led to the electron cloud

James Chadwick

Oct 31, 1932

James confirms the existence of neutrons whitch have no charge. Atomic nucleui contain certain neutrons and positivly charged protons.