History of Atomic Theory

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Presentation transcript:

History of Atomic Theory Research the discoveries and experiments of scientists and their contribution to “atomic theory” use textbook & internet Public/All/Kent/Ato mic Research site your sources Create a poster

Democritus & Dalton Democritus (460 BC) First to develop the idea that matter was made of “atoms”. Dalton (1803) Proposed the atomic theory atoms are indivisible & indestructible elements have unique atomic masses

Mendeleev (1869) Developed the first basic periodic table Table was arranged by atomic weight was able to predict elements which hadn’t been found

J.J. Thomson (1898) • Discovered electrons (-e) • Atoms have — & + charges

Rutherford (1911) Discovered the positively charged nucleus shot positively charged particles through gold foil electrons moved in circles

Bohr (1913) Electrons move in specific energy levels (orbits) around the nucleus

Schrodinger (1926) Described electrons as waves Electron cloud

Chadwick (1932) Neutrons (and protons) made up the nucleus

Evolution of the Atom

Evolution of the Atom