I am unsure if this is the correct question, but this is what I think is the full question:
An atom of an element is shown by the model.
How is this model useful?
O It shows how electrons are distributed in the shells of an iron atom.
O It shows how electrons are distributed in the shells of a cobalt atom.
O It shows how orbitals are distributed in the shells of an iron atom.
O It shows how orbitals are distributed in the shells of a cobalt atom.
The answer to this question is It shows how electrons are distributed in the shells of an iron atom (1st option).
The picture below is the model.