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History of Atom Questions and Answers Fully Solved
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Exam of 2 pages for the course Atom at Atom (History of Atom)
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History of AtomAtom - answer smallest part of an element that keeps the element's properties
Democritus - answer Greek philosopher that believed atoms were the smallest piece of
matter
John Dalton - answer English chemist who developed the Atomic Theory
Aristotle - answer philosopher that stated all matter is composed of 4 elements - air,
earth, water, and matter
Atomic theory - answer proposed by John Dalton
1. All elements are composed of atoms that are indivisible and indestructible (not true
because protons, neutrons and electrons were discovered)
2. Atoms of the same element are exactly alike (not true because of isotopes)
3. Atoms of different elements are different.
4. Compounds are formed by the joining of atoms of 2 or more elements.
JJ Thomson - answer- scientist who discovered the electron (negatively charged
subatomic particle) using a cathode ray tube
- developed plum pudding model
Plum Pudding model - answer-a model of the atom created by JJ Thomson
- consists of electrons on the surface of a positively charged sphere
Robert Millikan - answerScientist who devised the oil drop experiment which allowed the
charge on the electrons to be calculated
Ernest Rutherford - answerdiscovered the nucleus by shooting alpha particles through a
thin piece of gold foil
cathode tube experiment - answerexperiment done by JJ Thomson in which he
discovered the electron
Gold foil experiment - answeran experiment performed by Rutherford that provided
evidence that atoms are mostly empty space and have a dense, positive nucleus
Niels Bohr - answerscientist proposed a model of atom based on energy levels (Each
energy level has a different amount of energy; the farther away an electron is from the
nucleus, the more energy it has)
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