Structure of the Atom

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No energy can be transferred to Hg below 4.88 eV because not enough energy is available to excite an electron to the next energy level

Above 4.88 eV, the current drops because scattered electrons no longer reach the collector until the accelerating voltage reaches 9.8 eV and so on.

Slide 29

More details on the Bohr Model

The electron and hydrogen nucleus actually revolved about their mutual center of mass.

The electron mass is replaced by its reduced mass.

The Rydberg constant for infinite nuclear mass is replaced by R.

Slide 30

Limitations of the Bohr Model

The Bohr model was a great step of the new quantum theory,

but it had its limitations.

Works only to single-electron atoms.

Could not account for the intensities or the fine structure of the spectral lines.

Could not explain the binding of atoms into molecules.