Who is Neils Bohr?

Niels Bohr (1885-1962) was a Danish physicist and Nobel Prize-winner who made several fundamental contributions to our understanding of atomic physics and quantum mechanics. Many students first encounter Bohr's thinking in Middle or High School science classes, in the form of Bohr's model, which depicts electrons as dots on orbitals surrounding a central nucleus. Although Bohr's model is not an accurate depiction of the atom — the position of an electron is uncertain and is better represented as a foggy probability distribution — it is pragmatically useful in teaching students the basics of atomic physics. Bohr's model portrays how an atom has a series of energy levels electrons may occupy, called orbitals, with fixed limits on occupancy. It also shows how electrons emit and absorb photons and change energy levels accordingly. Bohr developed many of the concepts behind his model of the atom working at the University of Copenhagen. in the late 1910s and throughout the 1920s. He ...  more

What is a Bohr model of an atom? WEDNESDAY: Update gradesheet. Fall Project information. Current Science Events. Review atomic structure and Bohr models. Calculate # of neutrons and protons by Atomic Mass #. Learn about the electron shells. PRELAB for Mystery Chemicals (two day lab) HW: Begin observations for Fall Project. The moon phase now is ?? Look at the moon. Draw what you see. Use page 308 for help.Begin making observations on plants and animals in the fall. THURSDAY: First day of Mystery Chemical Inquiry Lab. Design your lab to determine the mystery chemical. Determine your procedure and data table that will help you identify the mystery substance # 5 HW: Fall Project and Review chapters 1 2 and 3. FRIDAY: Second day of Mystery Chemical Inquiry Lab. Test and record data for the mystery substances and determine composition of #5. HW: Write or type and print your Lab report. Due Monday, October 29, 2007. Work on your Fall project. Look at the night sky. Draw the moon. Name the ...