Describe quantum model of an atom in terms of energy levels of sub levels and orbitals

According to Neils Bohr, the atomic structure is described as electrons orbiting around the nucleus in orbitals. Each orbital holds two electrons that are oppositely spinning, according to Pauli's Exclusion Principle. These orbitals are then located in sub-shells of varying energy levels. There are 4 types of these sub-shells. In order of decreasing energy, they are the s, p ,d and f sub-shells. They differ in shape and energy levels. The s sub-shell holds on orbital, p holds three, d holds 5 and f holds 7 orbitals. These sub-shells are oriented according to their principal quantum number. There are a total of 7 energy levels with 1 being the strongest and closest to the nucleus, and 14 being the weakest and farthest to the nucleus. You will see that electrons are filled from the strongest 1s orbitals, to the weakest 7f orbital.

It’s the 1st choice, the size of an atom decreases as you go from left to right in the period.