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Timeline of the Atom

Timeline of the Atom

-0450 – Leucippus
-0450 – Empedocles – “roots” (elements)
-0400 – Democritus
-0300 – Epicurus
-0200 – Kanada

1789 – Lavoisier – conservation of mass
1799 – definite proportions (Proust)
1803 – atomic weights (Dalton)
1811 – Avogadro’s law
1838 – dark space (Faraday)
1855 – vacuum tube
1857 – Geissler tubes
1869 – periodic table of the elements (Mendeleev)
1870 – cathode ray tubes (Crookes)
1873 – electromagnetic waves (Maxwell)
1891 – electron – term created (Stoney)
1895 – radiation (Roentgen)
1896 – Becquerel
1896 – Zeeman effect – spectral lines
1897 – electron discovered (JJ Thomson)
1900 – quanta – Planck
1909 – nucleus discovered – Rutherford supervised Geiger-Marsden experiment
1909 – electron charge (Milikan)
1911 – cloud chamber
1913 – quantum theory
1919 – proton discovered
1924 – wave particle duality (deBroglie)
1924 – spin (Pauli)
1926 – wave mechanics – Schrodinger wavefunction equation
1928 – Dirac equation
1932 – neutron (Chadwick)
1932 – positron (Anderson)

SEE ALSO:
Atoms and the Periodic Table (1 of 15)
The Discovery of the Electron (2 of 15)
The Discovery of the Atomic Nucleus (3 of 15)
The Existence of Quarks (4 of 15)
The Standard Model of Particle Physics (5 of 15)

BBC The Atom – Jim Al-Khalili – Part 1 – Clash of the Titans 1/6 (2007)
BBC The Atom – Jim Al-Khalili – Part 1 – Clash of the Titans 2/6 (2007)
BBC The Atom – Jim Al-Khalili – Part 1 – Clash of the Titans 3/6 (2007)
BBC The Atom – Jim Al-Khalili – Part 1 – Clash of the Titans 4/6 (2007)
BBC The Atom – Jim Al-Khalili – Part 1 – Clash of the Titans 5/6 (2007)
BBC The Atom – Jim Al-Khalili – Part 1 – Clash of the Titans 6/6 (2007)

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