1803 John Dalton Father of the Modern Atomic Theory

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History of Atomic Theory

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Presentation transcript:

1803 John Dalton Father of the Modern Atomic Theory Proposes his theory, based on scientific research

Postulate #1 True or Wrong? Elements are composed of atoms, which are very small, indivisible, indestructible particles. True or Wrong?

……we know about subatomic particles. Wrong ……we know about subatomic particles.

Postulate #2 True or Wrong?? All atoms are of the same element are identical. True or Wrong??

Wrong ….they aren’t exactly the same because of isotopes (atoms with same number of protons but different number of neutrons).

Postulate #3 Atoms of different elements have different properties. True or Wrong??

Postulate #4 True or Wrong?? Atoms combine in small, whole-number ratios to form compounds. True or Wrong?? Two Hydrogen One Oxygen H2O

Postulate #5 True or Wrong?? Atoms of one element cannot change into an atom of a different element during a chemical reaction. True or Wrong??

1897 JJ Thompson Electrons discovered by experiments with cathode ray tubes + magnetic field - Magnetic field Electron stream w/o applied magnetic field Electron stream after applied magnetic field **He was finally able to show that the beam could be deflected by an electric field, and thus consisted of NEGATIVELY CHARGED PARTICLES (AKA ELECTRONS)

1904 JJ Thompson again… Published atomic theory that’s now known as Plum Pudding Model Thought electrons moved randomly in a positively charged, amorphous “pudding” or cloud Actual plum pudding!

1909 Rutherford Gold Foil Experiment Proved the existence of the atomic nucleus

1911 Rutherford Because of the Gold Foil Experiment, Rutherford publishes a new version of the atomic theory Rutherford’s Atomic Theory: The atom has a dense, positively charged core (aka nucleus) which contains most of the mass. Most of the atom is empty space. The electrons are somehow moving around the empty space.

1915 Negative electron Niels Bohr proposes the Bohr Model, also called the Planetary model This states the electrons orbit the nucleus much like planets around the sun (which we now know is not exactly how electrons travel!) Nucleus (positively charged)

What we know now! Watch this video… http://www.youtube.com/watch?v=K-jNgq16jEY Now we know that electrons travel around the nucleus, not in circles but in different shaped patterns!