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4 Terms

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solid sphere model


John Dalton- matter is made of atoms

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plum pudding model


JJ Thomson- atom is composed by electrons embedded in sea of positive charges

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Nuclear Model


Ernest Rutherford- atom is roughly like a planetary system, electrons orbits a central positive nucleus

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Quantum Model


Erwin Schrödinger

electrons are wave-particles with quantized energy whose exact location cannot be determined

- we can only define orbitals —> region where electrons are most likely localized