Development of the Atomic Model Flashcards

1
Q

Democritis

A
  • Greek Philosopher
  • First to identify the possiblity of an atom because he thought that matter is made of small particles
  • He named these the “ultimate” particles atomos which means indivisible
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2
Q

Aristotle

A
  • Dismissed Democritis’ atom idea as worthless
  • Believed in reasoning instead of scientific experiments
  • Said there was always a smaller piece of mater, no matter the size
  • Four “elements” of earth, fire, air, water
  • Theory accepted for 2000 years
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3
Q

Antione Laviosier

A

Law of Conservation of Mass - Matter is not create or destroyed, just changed in a reaction

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4
Q

Joseph Proust

A

Law of Definite Proportions - Always have the same proportions of elements by mass

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5
Q

John Dalton

A
  • Father of modern atomic theory
  • Model of solid sphere
  • Law of Multiple Proportions
  • Developed concept of the mole
  • Proposed system of symbols
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6
Q

J.J. Thomson

A
  • Discovered electron in 1897
  • Known for plum pudding model
  • Cathode ray tube experiment
  • Discovered isotopes of elements
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7
Q

Eugene Goldstein

A
  • Discovered protons in 1900
  • Anode ray experiment
  • Said that since atoms contain negatively charged particles, they must also contain positively charged particles in order to remain electrically neutral
  • Supported Thomson’s Plum Pudding Model
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8
Q

Max Planck

A
  • Founder of quantum theory
  • Atoms can emit “quanta”
  • Einstein used his work to study photons
  • Planck’s constant
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9
Q

Robert Millikan

A
  • Oil drop experiment
  • Measured charge of electron
  • Calculated mass of electron
  • Worked with Thomson
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10
Q

Ernest Rutherford

A
  • Discovered atoms have a small positive nucleus and remainder is empty space
  • Gold Foil Experiment
  • Predicted existence of neutrons
  • Worked for Thomson
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11
Q

Francis Aston

A
  • First person to observe isotopes
  • His work led Rutherford to predict the existence of the neutron
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12
Q

Neils Bohr

A
  • Planetary model of atom
  • Electrons move around the nucleus in fixed orbits, paths or energy levels
  • Spectrum lines produced when electrons move
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13
Q

Erwin Schrodinger

A
  • Another founder of quantum mechanics
  • Famous for his equation and the cat analogy
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14
Q

James Chadwick

A
  • Discovered neutrons in 1932 which led to discovery of fission and the atomic bomb
  • Helped with the development of the nuclear model
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15
Q

Louis de Broglie

A
  • Wave-particle duality theory of light meaning electrons have properties of both waves and particles
  • Created a new field of physics called wave mechanics
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16
Q

Werner Heisenberg

A
  • Founder of quantum mechanics
  • Uncertainty principle
  • Impossible to determine he position and the momentum of a particle at the same time
  • “Cloud” model aka quantum mechanical model
17
Q

What are the postulate of the Atomic Theory?

1) Matter is composed of very tiny or microscopic particles called “Atom”.
2) Atom is an indivisible particle.
3) Atom can neither be created nor it is destroyed.
4) All of the above.

A

4) All of the above.