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Dalton
John Dalton the father of atomic theeory. An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons. Electrons occupy only certain orbits around the nucleus. Those orbits are stable and are called, stationary orbits. Each orbit has an energy associated with it. The orbit nearest the nucleus has an energy of E1, the next orbit E2. The energy and frequency of light emitted. -
Bohr
Born in Copenhagen in 1885 to well-educated parents, Bohr became interested in physics at a young age. He studied the subject throughout his undergraduate and graduate years and earned a doctorate in physics in 1911 from Copenhagen University. -
Joseph John
n 1897 the British physicist Joseph John (J. J.) Thomson (1856–1940) discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by numerous scientists at the time. -
Thomson
n 1897 the British physicist Joseph John (J. J.) Thomson (1856–1940) discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by numerous scientists at the time. -
Rutherford
Rutherford had conducted experiments in which he shot relatively large, charged particles (alpha particles) at a thin gold foil. He found that most of the particles passed directly through the foil, but some came off at odd angles, as though they had been deflected. From these results, Rutherford concluded that each atom was mostly empty space, but also contained a dense region central mass, which his alpha particles could not pass through.
