Atomic Scientists I Quiz Key

Name:______KEY______Date:______Period:_____

Directions Match the date of each major accomplishment on the right with the name of the scientist credited for this accomplishment on the left. Each choice is used only once and there are a few scientists not used at all.

1909 Robert Millikan 1897 – First credited with the inclusion of the “corpuscle”.

1900 Max Planck 1925 – First to assert that no electron can have the same set of quantum numbers at the same instant in time. James Van Allen 1911 – First to propose a planetary model of the atom with a nucleus at 1924 Louis deBroglie the center and electrons in orbits around it.

1885 J.J. Balmer 1900 – First to propose that there is a minimum size or quanta in which atoms can release or absorb energy. 1911 Ernest Rutherford 1926 – First to provide both the wave and particle properties of the 1913 Niels Bohr electron in one equation.

1923 Arthur Compton 1913 – First model that restricts an electron to specific energy levels. 1924 – First to propose that an orbiting electron has a particular 1932 James Chadwick wavelength associated with it. 1905 Albert Einstein 1927 – First to assert that it is impossible to know both the exact

1925 Wolfgang Pauli momentum of an electron and its exact location in space at the same time. 1927 Werner Heisenberg 1904 – First to propose a “Saturnian” model of the atom. James Kirk 1905 – First successful explanation of the photoelectric effect.

James Maxwell 1932 – First to prove the existence of the neutron. 1885 – First described the emission spectrum of hydrogen. 1897 J.J. Thomson 1923 – First to accurately describe the scattering of x-rays. 1926 Erwin Schrodinger 1909 – First successful measurement of the elementary charge of an

1904 Hantaro Nagaoka electron.