Question

known as fine spectra, Sommerfeld modified Bohr's atomic model by
adding elliptical orbits. While retaining the first of Bohr's circular orbit
orbits to Bohr's third orbit, etc., such that the nucleus of the atom is one
fig-4: The allowed electronic orbits for the main Quan
In an attempt to account for the structure (splitting) of line spectra
as such, he added one elliptical orbit to Bohr's second orbit, two elliptical
of the principal foci of these elliptical orbits. He was guided by the fact
that, in general, periodic motion under the influence of a central force
will lead to elliptical orbits with the force situated at one of the foci.
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Bohr-Sommerfeld model, though successful in accounting for the
ine line structure of hydrogen atomic spectra, does not provide a
atisfactory picture of the structure of atom in general.
This model failed to account for the atomic spectra of atoms of
ore than one electron.
Why is the electron in an atom restricted to revolve around the nucleus
at certain fixed distances?​

Answer 1

Answer:

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Answer 2

Answer:An electron is restricted to move around the nucleus at restricted distances because the distance at which they revolve around the nucleus is determined by their principal quantum number, electrons do not gain or lose energy in these shells and revolve with constant acceleration.

Explanation:

The electrons revolve around the nucleus only in certain fixed paths called orbits. They are K, L, M, N, etc. Each orbit consists of a fixed number of electrons. The electrons are distributed in the orbits according to the formula 2$n^{2}$ .All it needs is the electrostatic attraction between the positively-charged protons in the atom's nucleus and the negatively-charged electron. In short, electrical attraction to the nucleus is what keeps the electron in orbit, and this attraction doesn't cost energy.

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