The Bohr Model of the Atom
A tentative description of a system or theory that accounts for all of
its known properties.
The smallest indivisible (by chemical reaction) particle of an element
that can either exist alone or enter into chemical combination. An atom
consists of a central positively charged nucleus surrounded by a sufficient
number of negatively charged electrons to balance the nucleus.
The spectrum of frequencies of radiation (light) emitted by an atom or
a molecule in a transition from a higher state to a lower energy state.
A condition or mode of being with regard to a set of circumstances; position.
The Danish physicist that attempted to account for the emission spectrum
of atomic hydrogen by proposing that the single electron in the hydrogen
atom travels in definite circular orbits around the central nucleus and
that only certain orbits were possible at certain energies. This is what
we call the Bohr model.