Democritus by 17platowsa

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Slide Notes

Democritus

Published on Nov 18, 2015

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PRESENTATION OUTLINE

Democritus

He used philosophy, not science.
Atoms were indivisible and indestructible.
Everything is made up of atoms.

John Dalton

Saw atoms as tiny, indestructible particles.
Atoms had no internal structure.
All matter are made of atoms.
Compounds are of 2 atoms.
A chemical reaction is a rearrangement of atoms.

J.J. Thomson

He discovered the electron.
Believe electrons had a positive charged in atoms.
His work showed that atoms were made up of small particles.
He proved that his theory using the cathode ray tube.

Ernest Rutherford

Atom has a small, dense, positively charged nucleus.
Electrons move around the nucleus.
Atoms made up of a central charge.
His model showed a energic charge in the atoms.

Neils Bohr

Electrons moves in a circular orbit.
Found calculation for positive energy levels.
Discovered radioactivity of electrons.
Discovered hydrogen atoms base.

Erwin schrodinger

Develops mathematical equations to describe motion of electrons.
His work lead to the electron of cloud model.
Electrons have certain orbit around nucleus.
Predicts the odds of the location of the electrions.

James chadwick

Discovered the neutron.
Discovered that the beam was not deflected by either fields.
Neutrons were found to have the same mass as protons.
The nucleus on same energy levels as the electrons.

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