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Sep 27, 1101
Democritus Aristotle
the first person to find the atoms and say atoms -
Antonie Lavosier
He helped make up the metric system. -
Joseph Proust
Law of Constant Composition -
John Dalton
HE FOUND OUT THE ATOMIC WEIGHT. -
Amadeo Avagadro
he number of atoms it takes to make 12 grams of carbon -
Louis deBroglie
the positive charged subatomic particle and found its mass -
Henri Becquerel
radiation and radioactive decay -
William Crooks
inventing the Crookes tube -
Max Planck
Quantum Theory -
Albert Einstein
he found how fast the atom traveld. -
Niels Bohr
Bohr nuclear model of the Atom -
Ernest Rutherford
next step in atomic structure is nucleus with neutrons and protons in it. -
Werner Heisenberg
velocity and position of an electron at the same time. -
Robert Millikan
measurement of the charge on the eletrons. -
Henry Moseley
HE rearaged the Periodic -
Madame Curie
research on radioactivity -
J.J. Thomson
He is credited for the discovery of the electron and of isotopes, and the invention of the mass spectrometer -
James Chadwick
his discovery of the netrons.
