The Atom Timeline

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The Atom Timeline

The History of The Atom

1898British scientist Sir William Ramsay and Moris W. Travers discover three elements-krypton, neon, and xenon-in three months. The periodic table developed by Mendeleev helps guide their research.

1848James Marshall finds gold while builing Sutter's Mill, starting the California gold rush

1897British scientist J.J. Thomson identifies electrons as particles that are present in every atom.

1803British scientist and school teacher John Dalton reintroduces teh concept of atoms with evidence to support his ideas.

1869Russian chemist Dmitri Mendeleev develops a periodic table that organizes the elements known at that time.

1932The neutron, one of the particles in the necleus of an atom, is discovered by British physicist James Chadwick.

1964Scientists propose the idea that smaller particles make up protons and neutrons. The particles are name quarks after the work used by James Joyce in his book Finnegans Wake.

1989Germans celebrate when the Berlin Wall ceases to function as a barrier between East and West Germany.

1911Ernest Rutherford, a physicist from New Zealand, discovers the positively charged nucleas of the atom.

1981Scientist in Switzerland develope a scanning tunneling microscope, which is used to see atoms for the first time.

Around400 B.C.The Greek philosopher Democritus proposes that small particles called atoms make up all mater.

1945The United Nations is formed. Its purpose is to maintain world peace and develope friendly relations between countries.

1996Another element is added to the periodic table after a team of German scientist synthesize an atom containing 112 protons in its nucleus.


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