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460 BCE
Democritus Birthday
Known in antiquity as the 'laughing philosopher'. -
400 BCE
Democritus Named the Atom
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400 BCE
Democritus Theories about Particles
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370 BCE
Democritus Death
He believed that atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped. -
John Dalton Birthday
He started teaching at a local school when he was twelve. -
John Dalton Accepted to Manchester's Literacy
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John Dalton Atomic Weight
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J.J. Thomson Birthday
He was a recipient of the Order of Merit. -
Robert Millikan Birthday
Millikan was an enthusiastic tennis player, and golf was also one of his recreations. -
Ernest Rutherford Birthday
Ernest Rutherford demonstrated that there were at least two distinct types of radiation: alpha radiation and beta radiation. -
J.J. Thomson discovered corpuscle
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John Dalton Death
He believed that all matter is made of atoms, which are indivisible. -
Niels Bohr Birthday
Niels Bohr was born and raised in Copenhagen. -
James Chadwick Birthday
Chadwick was knighted in 1945. -
Ernest Rutherford Discovers 2 types of Rays
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Ernest Rutherford Discovered a Radioactive Gas
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Werner Heisenberg Birthday
He played the piano. -
J.J. Thomson Plum Pudding Atom
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J.J. Thomson Nobel Prize
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Ernest Rutherford Discovered the Nucleus
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Niels Bohr Paper on Atomic Model, Atomic Model
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Robert Millikan oil drop experiment
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Ernest Rutherford discovered the Protons
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Niels Bohr Book on Quantum Theory
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Werner Heisenberg Matrix Mechanics
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Werner Heisenberg The uncertainty Principle
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James Chadwick Discovery of the Neutron
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Ernest Rutherford Death
He believed that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. -
J.J. Thomson's death
He believed that all atoms contain tiny negatively charged subatomic particles or electrons. -
Niels Bohr Letter to UN regarding nuclear weapons
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Robert Millikan Death
The accurate determination of the charge carried by an electron, using the elegant “falling-drop method”. -
Niels Bohr Death
He thought that some physical quantities only take discrete values. -
James Chadwick Death
He proved the existence of neutrons. -
Werner Heisenberg Death
That formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle.
