People Flashcards
(8 cards)
The Greek philosopher who theorized that the world is made up of indivisible tiny particles; He named these particles “atomos.”
Democritus
The Nobel Prize-winning scientist credited with naming alpha, beta, and gamma radiation, discovering the nucleus of the atom, and naming the proton; The alpha-scattering gold foil experiment was used to show atoms have a dense, positive nucleus which scattered alpha particles
Ernest Rutherford
The Nobel Prize-winning scientist credited with developing the wave equation for an electron which corresponds to an electron’s energy; He was a pioneer in the Quantum Wave Mechanical Model for an atom.
Erwin Schrödinger
The scientist credited with discovering the electron; The cathode ray tube experiment was used to show atoms contain a negatively-charged particle referred to as the electron. He described the atom in terms of the Plum Pudding Model. He also discovered isotopes by inventing the first mass spectrometer.
J.J Thomson
The English schoolteacher credited with “modernizing” atomic theory; He said, 1) Elements are made of tiny particles called atoms. 2) Atoms of one element are identical while atoms of different elements are different. 3) Atoms may be rearranged during a chemical reaction, but they must be conserved. 4) Different atoms form compounds in constant ratios.
John Dalton
The Nobel Prize-winning scientist credited with describing electrons as both waves and particles; He was a pioneer in the Quantum Wave Mechanical Model.
Louis de Broglie
The Nobel Prize-winning scientist credited with developing the Quantized (Solar System) Model of the atom where electrons followed orbits with specific energy levels.This helped to explain the line emission spectra of elements.
Niels Bohr
The Nobel Prize-winning scientist credited with discovering the charge and mass of an electron through the use of his oil drop experiment
Robert Millikan
