history of the atomic model
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History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC)
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) Reasoned that matter was composed of Reasoned that matter was composed of
a few indivisible units that combine to a few indivisible units that combine to make everything around us.make everything around us.
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800)
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800)
Conducted experiments that showed Conducted experiments that showed small units of matter (atoms) combine small units of matter (atoms) combine in specific ways. in specific ways.
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897)
CRT animation
Plumb pudding model
Dr. Cox on Thompson
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897)
Squeezed electrons out of atoms Squeezed electrons out of atoms demonstrating that atoms are made of demonstrating that atoms are made of smaller particles. Thompson is smaller particles. Thompson is responsible for the plumb pudding responsible for the plumb pudding (chocolate chip cookie) model.(chocolate chip cookie) model.
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897) Ernest Rutherford (1898)Ernest Rutherford (1898)
How it works
Dr. Cox on Rutherford
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897) Ernest Rutherford (1898)Ernest Rutherford (1898)
Demonstrated that atoms contain small Demonstrated that atoms contain small heavy positively charged centers. We heavy positively charged centers. We call that center the nucleus.call that center the nucleus.
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897) Ernest Rutherford (1898)Ernest Rutherford (1898) Niels BohrNiels Bohr
Bohr model
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897) Ernest Rutherford (1898)Ernest Rutherford (1898) Niels BohrNiels Bohr
Demonstrated that electrons exist in Demonstrated that electrons exist in specific energy levels. As electrons drop specific energy levels. As electrons drop from high to low orbitals only specific from high to low orbitals only specific colors of light are released.colors of light are released.
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897) Ernest Rutherford (1898)Ernest Rutherford (1898) Niels Bohr (1915)Niels Bohr (1915) Erwin Schrodinger and Werner Erwin Schrodinger and Werner
Heisenburg (1926)Heisenburg (1926)
What is it…wave or particle?
Lame song
History of the Atomic History of the Atomic ModelModel
Democritus (400 BC)Democritus (400 BC) John Dalton (1800)John Dalton (1800) J.J. Thompson (1897)J.J. Thompson (1897) Ernest Rutherford (1898)Ernest Rutherford (1898) Niels Bohr (1915)Niels Bohr (1915) Erwin Schrodinger and Werner Erwin Schrodinger and Werner
Heisenburg (1926)Heisenburg (1926) Electrons are weird. More like clouds than Electrons are weird. More like clouds than
particles.particles.
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