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1.3: Experiment 2 - Atomic Theory

  • Page ID
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    Learning Objectives

    By the end of this lab, students should be able to:

    • Compare the Bohr model of the atom with the Schrödinger's model.
    • Explain how light interacts with matter to produce line spectrum.
    • Calculate the relationship between wavelength and energy of a photon.

    Prior knowledge:


    The smallest piece of an element that maintains the identity of that element is called an atom. Individual atoms are extremely small. It would take about fifty million atoms in a row to make a line that is 1 cm long. The period at the end of a printed sentence has several million atoms in it. Atoms are so small that it is difficult to believe that all matter is made from atoms-but it is.



    Work with your group in Zoom Breakout Rooms to solve the problems in the Worksheet. Don't forget to show your calculations for partial credit.

    Interactive Element

    Lab Report

    Use the PhET simulation below to answer the questions in your Lab Report.

    Part I: White light

    1. Turn on the gun.
    2. Make sure you selected "White".
    3. Select "Show spectrometer"
    4. Answer the questions in Part I of the Lab Report.

    Part II: Prediction

    1. Switch from Experiment to Prediction in the upper left hand corner of the simulation. 
    2. Switch to the Bohr model and turn on the Show electron energy level diagram in the upper right hand corner. Watch to see what happens in the simulation, the electron energy level diagram and the spectrometer. Answer the questions in your report regarding this model.
    3. Turn on the Schrodinger model of the atom. Answer the question in your report regarding this model.

    Interactive Element




    Contributors and Attributions

    • Robert E. Belford (University of Arkansas Little Rock; Department of Chemistry) led the creation of this page for a 5 week summer course. 

    • Elena Lisitsyna contributed to the creation and implementation of this page.

    • Mark Baillie coordinated the modifications of this activity for implementation in a 15 week fall course, with the help of Elena Lisitsyna and Karie Sanford.


    1.3: Experiment 2 - Atomic Theory is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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