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Max Planck
Max Planck is a German Scientist who was born April 23, 1858, in Kiel, Germany. He discovered the Quantum Theory, which explains the nature and behavior of matter and energy of quanta. He made observations on the wavelength distribution of the energy radiated by a black body as a result of its temperature. He died on October 4, 1947, in Göttingen, Germany. -
Albert Einstein
Albert Einstein is a German Scientist who was born March 14, 1879, in Württemberg, Germany. He proved the existence of atoms. Einstein provided the first experimental evidence of the existence of atoms in his study, "On the Movement of Small Particles Suspended in Stationary Liquids Required by the Molecular-Kinetic Theory of Heat." By observing the Brownian motion of microscopic particles hanging in still water, he was able to gauge the size of the jostling atoms. He died April 18, 1955. -
Robert Millikan
Robert Millikan is an American Scientist who was born on March 22, 1868, in Illinois, United States. He was able to find the charge of an electron through conducting the Oil-drop experiment. He died on December 19, 1953, in California, United States. -
Ernest Rutherford
Ernest Rutherford is a British Scientist who was born on August 30, 1871, in New Zealand. He discovered that the protons and neutrons in the nuclear atom are found in the nucleus in the center of the atom, where they make up almost all of the atom's mass. The majority of the atom's volume is taken up by the electrons, which are arranged around the nucleus. He conducted the Gold Foil experiment to prove his theory. He died on October 19, 1937. -
Niels Bohr
Niels Bohr is a Danish Scientist who was born Copenhagen, Denmark in 1885. He created the Bohr Model. According to the Bohr model, an atom consists of a tiny, positively charged nucleus that is surrounded by electrons. Bohr was the first to realize that electrons move in different orbits around the nucleus and that an element's properties are determined by the number of electrons in its outer orbit. He died in 1962. -
Louis De Broglie
Louis De Broglie is a French Scientist who was born August 15, 1892, in Dieppe, France. He came up with a theory that particles, such as electrons, could be characterized as both particles and waves. His theory was demonstrated by The Davisson and Germer electron diffraction experiment which confirmed his hypothesis. He died on March 19, 1987, in Paris, France. -
Erwin Schrodinger
Erwin Schrodinger is a German Scientist who was born August 12, 1887, in Vienna, Austria. He came up with the wave equation which demonstrates the behavior and energy level of the electrons. He didn’t do an experiment. He came up with the wave equation from his disagreement with the quantum condition in Bohr's orbit theory and his idea that an eigenvalue problem should dictate the properties of atomic spectra. He died on January 4, 1961, in Vienna, Austria. -
Werner Heisenberg
Werner Heisenberg is a German Scientist who was born December 5, 1901, Würzburg, Germany. He came up with the Uncertainty Principle which states that the location and speed of a particle are not precisely known. He conducted a thought experiment. He thought of using a gamma ray microscope to track the position of an electron. He died February 1, 1976, Munich, West Germany. -
James Chadwick
James Chadwick is a British Scientist who was born October 20, 1891, in Manchester, United Kingdom. He discovered that a neutral particle called a neutron existed and that it has the same mass as a proton. He fired alpha particles at beryllium. It emitted a powerful radiation. He proved that the radiation was made up of particles with a mass roughly equivalent to that of the proton but without electrical charge. He died on July 24, 1974, in Cambridge, United Kingdom.