the National Science Foundation Available Languages: English,
Spanish This classroom-tested learning module gives a condensed,
easily-understood view of the development of atomic theory from
the late 19th through early 20th century. The key idea was the
discovery that the atom is not an "indivisible" particle, but
consists of smaller constituents: the proton, neutron, and
electron. It discusses the contributions of John Dalton, J.J.
Thomson, Ernest Rutherford, and James Chadwick, whose
experiments revolutionized the world view of atomic structure.
See Related Materials for a link to Part 2 of this series.
atomic structure, cathode ray experiment, electron, helium atom,
history of atom, history of the atom, hydrogen atom, neutron,
proton Metadata instance created July 12, 2011 by Caroline Hall
October 10, 2012 by Caroline Hall Last Update when Cataloged:
January 1, 2006 AAAS Benchmark Alignments (2008 Version) 4. The
Physical Setting 4D. The Structure of Matter 6-8: 4D/M1a. All
matter is made up of atoms, whic