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Atoms - Coggle Diagram
Atoms
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Aristotle and Plato
Until Aristotle and Plato completely disagreed with Democritus' statement. They say that all matter is made of Earth, Fire, Water and Air.
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John Dalton
Early 1800, Dalton considered Democritus' idea of atoms. He invented his own atom ball model.
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Ernest Rutherford
Years after, Rutherford reasoned that all of an atom's positively charged particles were contained of nucleus. He also invented his own Nuclear Atom
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J.J. Thomson
In 1897, J.J. Thomson discovered the Electron. He used cathode ray tube to deduce the presence of a negative charged particle.
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Niels Bohr
2 years after, Niels Bohr proposed an improvement in his model which he placed each electron in a specific energy level called shells or orbit.
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James Chadwick
In 1932, Chadwick found out that the mass of the atoms is concentrated with the nucleus of the atom.
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What is Atom?
An atom is the basic unit of an element. An atom is a form of matter which may not be further broken down using any chemical means. A typical atom consists of protons, neutrons, and electrons.
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What is Element?
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei
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Electronegativity
Electronegativity, symbol x measures the tendency of an atom to attract a shared pair of electrons (or electron density).
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