Bohr radius
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In Bohr's model of the hydrogen atom, the Bohr radius () is the radius of the lowest energy orbit:

where:

is the permittivity of vacuum

is the Planck's constant

is the electron rest mass

and

is the elementary charge

It has a value of 5.29189379×10^-11 m, or about half an angstrom.

The original article can be found at: http://en.wikipedia.org/wiki/Bohr_radius.
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