Dalton Electrons: (marble model) Protons: Neutrons: Other: Thomson Electrons: (plum pudding Protons: model) Neutrons: Other: Rutherford Electrons: (planetary model) Protons: Neutrons: Bohr Electrons: (quantum model) Protons: Neutrons: Important Scientists in the Atomic Theories and Models initial idea of atom Democritus -atomos, – - first atomic theory of matter, solid sphere model John Dalton – - discovery of the electron using the cathode ray tube experiment, plum pudding model J. J. Thomson – - discovery of the nucleus using the gold foil experiment, nuclear model Ernest Rutherford – - discovery of charge of electron using the oil drop experiment Robert Millikan – - energy levels, planetary model Niels Bohr – - periodic table arranged by atomic mass Dmitri Mendeleev – - periodic table arranged by atomic number Henry Moseley – - quantum nature of energy Max Planck – - uncertainty principle, quantum mechanical model Werner Heisenberg – - wave theory, quantum mechanical model Louis de Broglie. – DEVELOPMENT OF THE ATOMIC THEORY From 1000 B.C. to now DATE INFORMATION
Dalton (marble model) Electrons: Protons: Neutrons: Other: Thomson (plum pudding model) Electrons: Protons: Neutrons: Other: Rutherford (planetary model) Electrons: Protons: Neutrons: Bohr (quantum model) Electrons: Protons: Neutrons: Important Scientists in the Atomic Theories and Models -atomos, initial idea of atom – Democritus - first atomic theory of matter, solid sphere model – John Dalton - discovery of the electron using the cathode ray tube experiment, plum pudding model – J. J. Thomson - discovery of the nucleus using the gold foil experiment, nuclear model – Ernest Rutherford - discovery of charge of electron using the oil drop experiment – Robert Millikan - energy levels, planetary model – Niels Bohr - periodic table arranged by atomic mass – Dmitri Mendeleev - periodic table arranged by atomic number – Henry Moseley - quantum nature of energy – Max Planck - uncertainty principle, quantum mechanical model – Werner Heisenberg - wave theory, quantum mechanical model – Louis de Broglie. DEVELOPMENT OF THE ATOMIC THEORY From 1000 B.C. to now DATE INFORMATION
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