Bailey Cryts & Alexis Taylor
He was the first to apply quantum theory (the theoretical basis of modern physics that explains nature and behavior of matter and energy on the atomic and subatomic level) in a consistent model to explain the arrangement of electrons in the atom.
Discovered this around the 1920's
Importance of discovery
He assumed that electrons moved around atomic nuclei in certain stable orbits in which no energy was lost.
The number of valence electrons is a way the periodic table is constructed in rows/columns.
Contributed to the problems encountered in quantum physics, by development the concept of complementary properties (objects have complementary properties that cannot be measured accurately at the same time.)
Introduced atomic model theory that chemical properties of the element being largely determined by the number in the outer orbits.
If the atom absorbed energy, the electron jumped to a level further from the nucleus; if it radiated energy, it fell to a level closer to the nucleus.
"The Quantum Moment: How Planck, Bohr, Einstein, and Heisenberg Taught Us to Love Uncertainty." Publishers Weekly 25 Aug. 2014: 95. General OneFile. Web. 9 Oct. 2014.http://go.galegroup.com/ps/i.do?id=GALE%7CA380525195&v=2.1&u=j061911001&it=r&p=GPS&sw=w&asid=efee5ebf6710e320caba6c6d4ff9be08
"Niels Henrik David Bohr." Science and Its Times. Ed. Neil Schlager and Josh Lauer. Vol. 6. Detroit: Gale, 2000. Science in Context. Web. 9 Oct. 2014.