Niels Bohr

1. Niels Bohr Unlocking the Atom By Niels Bohr & Albert Einstein (Ronak Trivedi & Tim Jones)

2. NielsHenrik David Bohr Scientist’s Life Outline of Presentation A biography of Bohr’s life.Includes when and where scientist was born/place of education. A representation of a debate that Einstein and Bohr had. How the findings of Bohr advance the understanding of the atomic structure. All of the scientific milestonesIncludes experiments, and his atomic model. The atomic structure that Bohr created. Scientific Achievements Bohr Model of Atomic Structure Bohr vs. Einstein: Debate Contribution to Atomic Structure

3. Niels Bohr’s Life • Born on October 7, 1885 • In Copenhagen, Denmark • Father was a Professor of Physiology at Copenhagen University • My father sparked my interest of physics in my childhood • Home was filled with openness, and intelectuals • I also attended Copenhagen University and I obtained my doctorate in Physics in 1911 • Spent my final years in Copenhagen after WWII and spent the rest of my life advocating the peaceful use of Nuclear energy. “My interest in the study of physics was awakened while I was still in school, largely owing to the influence of my father.” -Niels Bohr, 1922

4. Scientific Achievements Bohr Model of Atomic Structure in 1913 • Introduced the theory of electrons orbiting around atomic nucleus. • The theory stated that electrons were contained in quantized energy states, when they drop from one state to another, or when they jump from one orbit to another, energy is emitted. It was already known that atoms emit radiation, but this theory stated how it was done. The outer orbits contain more electrons than the inner ones, the outer orbits determine the atoms chemical properties. This theory became essential to quantum theory, and was awarded the Nobel Prize in 1922. • Experiments that I used were previous works by other scientists. • Used Ernest Rutherford’s previous findings of an atom’s positively charged nucleus, surrounded by negatively charged electrons and added his own theory into it. Ernest Rutherford and his colleagues performed the Gold Foil Experiment, which proved the existence of the atomic nucleus. This important experiment was what I based my work off of as I furthered the model of the atomic structure.

5. Bohr Model of Atomic Structure The larger shells could hold more electrons. Each shell could hold electrons where n represents the shell number.

6. Scientific Achievements Other Accomplishments • Theoretical description of periodic table in 1920 • Theory of Atomic nucleus being a compound structure in 1936 • Ideas of uranium fission in terms of the isotope 235 in 1939 • Which lead to the project to make a nuclear fission bomb in 1943.

7. Bohr and Einstein Debates A theory of the very large and the theory of the very small clashing. “Not often in life has a human being caused me such joy by his mere presence as you did.“ -Albert Einstein 1920, in a letter to Bohr after a spirited debate Niels Bohr Albert Einstein • Quantum Theory: theory of the very small • Theory of Relativity: theory of the very large. • Critic of quantum theory "God does not play dice with the universe” "Einstein, stop telling God what to do!"

8. Contribution to Atomic Structure Bohr pushes further the understanding of the atom. • This is Ernest Rutherford’s model of an atom which was made in 1911, the one I based my work off of. • Later came my model in 1913. • The larger shells could hold more electrons. Each shell could hold: electrons where n represents the shell number. • Who knows what’s next? Maybe we will find little tiny people within these electrons, working them, who knows, the universe is a crazy place. • I wonder who created a better model of the atom. The theory stated that electrons were contained in quantized energy states, when they drop from one state to another, or when they jump from one orbit to another, energy is emitted. It was already known that atoms emit radiation, but this theory stated how it was done. The outer orbits of electrons determine the atom’s chemical properties.

9. Quiz Time! Oh Yeah!

10. Works Cited Crutcher, Todd. “NielsHenrik David Bohr.” Physics.eou.edu, n.d. Web. 31 Oct. 2010. Jones, Andrew Zimmerman. “Niels Bohr- Biography of Niels Bohr.” Physics.about.com, n.d. Web. 31 Oct. 2010. Blair, Mika. “NielsHenrik David Bohr.” CsuPonoma.edu, n.d. Web. 31 Oct. 2010. “History of the Atom Part 2: from Thomson to Bohr.” Green-Planet-Solar-Energy.com, n.d. Web. 31 Oct. 2010.