Atomic Spectra Lab 9 In the early 20 th century, gaseous elements were found to have a unique atomic spectra when subjected to a high voltage so that they emitted a light. This light when looked at through a prism or a transmission grating shows that the light is made up of individual wavelengths of light. The spectrum produced by these gaseous elements is called an emission spectrum. Each gas has it own unique emission spectrum. The four that you will encounter in today’s lab are shown on page 381 in your textbook. The reasoning for this phenomena baffled scientist until Niels Bohr discovered what is now called the Bohr’s model. Bohr model is that electrons spin around the nucleus like planets spin around the sun. Also that the electron orbits are quantitized, that is electrons can be in one fixed orbit or another fixed orbit but not between the orbits and that each of the orbits related to a certain energy level of the electron. Lastly, electrons can move from a lower orbit to a higher
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