Chemlab: Chemistry 6


Spectrum of the Hydrogen Atom

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Goals
In the first part of this experiment you will use a meterstick spectroscope to determine the wavelengths of visible light emitted by a hydrogen atom. The wavelengths of the emitted photons will be converted to photon energies which will then be used to identify the change in atomic energy level which gave rise to the emitted photon. The Bohr model will be used to provide the required expressions for the allowed discrete energy levels for a one-electron atom. In the second part of the experiment, you will observe the spectrum of the sodium atom in the same way. From the measured spectrum and the ground state sodium atom ionization energy you will be able to calculate the effective nuclear charge for a 3s and a 3p electron in the sodium atom. Finally, you will compare qualitatively the spectra of a series of elements and the light emitted by a fluorescent lamp.

To Learn or Review
Wave Motion and Light
Oxtoby, pp. 117-119

The Bohr model
Oxtoby, pp. 127-130

Intro to Quantum Mechanics
Oxtoby, pp. 114-116

Atomic Structure and Transitions between Energy States
Oxtoby, pp. 124-125


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