Question

What do you really mean by orbitals and sub shell according to quantum mechanical model

please don't answer that subshells are the part of the orbits and orbitals are subunits of subshells according to quantum numbers as quantum numbers form relationship between bohr's atomic model and wave mechanical model

Answer 1

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ACCORDING TO THE PRINCIPAL QUANTUM NUMBER

The principal quantum number n describes the average distance of the orbital from the nucleus — and the energy of the electron in an atom. It can have positive integer (whole number) values: 1, 2, 3, 4, and so on. The larger the value of n, the higher the energy and the larger the orbital. Chemists sometimes call the orbitals electron shells.

THE ANGULAR MOMENTUM QUANTUM NUMBER
The angular momentum quantum number l describes the shape of the orbital, and the shape is limited by the principal quantum number n: The angular momentum quantum number l can have positive integer values from 0 to n–1. For example, if the n value is 3, three values are allowed for l: 0, 1, and 2.
Orbitals that have the same value of n but different values of l are called subshells.