Understanding the diagram of Bohr's model of an atom:
Postulates of Bohr's Model of an atom:
Electrons (negative charge) in an atomic orbit or shell travel in a circular motion around a positive charge.
Although each shell has specified energy, these circular orbits are referred to as orbital shells.
A principal quantum number (n=1, 2, 3,...) is a number that indicates the energy levels. The nucleus's principal quantum range begins with the value of n, which has a reduced energy shell of n=1.
The primary shells K, L, M..... are represented by the orbitals n=1, 2, 3, 4..., and an electron is regarded in the ground state whenever it reaches the least energy level.
An electron acquires more energy as it moves from a low energy state to a higher energy level, and it loses energy when it moves from the higher energy state to a lower energy state.