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Additional
Bohr radius
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Bohr radius
The
Bohr radius
(
a
0
or
r
Bohr
) is a
physical constant
, approximately equal to the most probable distance between the
proton
and
electron
in a
hydrogen atom
in its
ground state
. It is named after
Niels Bohr
, due to its role in the
Bohr model
of an atom. Its value is 5.2917721092(17) m
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