Question

how many ellipitical orbits are there in fourth orbit?

Answer 1

There are 2 elliptical orbits in fourth orbit.

Answer 2

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Two elliptical orbits were added in third Bohr's orbit.

Purpose of adding was:

1) Failure of Bohr's model to account splitting of line spectra. In an attempt to account for line spectrum structure, Somerfield modified Bohr's atomic model by adding elliptical orbits.