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465 BCE
The History of the Atom
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400 BCE
Democritus short comings on his Atomic Theory
Democritus's ideas were not helpful in explaining chemical behavior because they lacked experimental support. -
370 BCE
Philosopher Democritus Atomic Theory
Democritus believed that all matter consisted of extremely small particles that could not be divided. He called these particles atoms. He thought there were different types of atoms with specific sets of properties. Atoms of liquids were round and smooth, atoms in solids were rough and prickly. -
460
Democritus
Democritus (/dɪˈmɒkrɪtəs/; Greek: Δημόκριτος, Dēmókritos, meaning "chosen of the people"; c. 460 – c. 370 BC) was an influential Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe. -
Daltons Theory
Dalton proposed the theory that all matter is made up of individual particles called atoms, which cannot be divided .Over time, scientists found that not all of Dalton's ideas about atoms were correct so they changed the table to take into account new discoveries. -
Enrico Fermi
Enrico Fermi (Italian: [enˈriːko ˈfermi]; 29 September 1901 – 28 November 1954) was an Italian physicist, who created the world's first nuclear reactor. -
Ernest Rutherford
Rutherford proposed a new model, all of an atom's positive charge is concentrated in its nucleus. By 1920, Rutherford had seen evidence of two subatomic particles and had predicted the existence of a third particle. Protons, electrons, and neutrons are subatomic particles.The short comings of Rutherford's Model of the atom was that it did not explain how the atom's negatively charged electrons were distributed. -
Bohrs model of an atom
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Enrico Fermi's Major Contributions
He is mainly remembered for his work on the advancement of the first nuclear reactor, and for his contributions to the development of quantum theory, nuclear and particle physics, and statistical mechanics. -
Neils Bohr
7 October 1885 – 18 November 1962 A Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Short coming-Bohr's theory does not give any information regarding the distribution and arrangement of electrons in an atom. -
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joke
"I hated learning about electrons. I got so Bohr'd."
